This specification covers an aluminum alloy in the form of hand forgings up to 5.000 inches (127.00 mm), inclusive, in nominal thickness at the time of heat treatment, procured to inch/pound dimensions (see 8.6

AMS D Nonferrous Alloys Committee

Anodic Treatment of Aluminum Alloys Sulfuric Acid Process, Dyed Coatings

AMS2472J (Current)

11/21/2024

This specification establishes the requirements for dyed anodic coatings on aluminum alloys

AMS B Finishes Processes and Fluids Committee

Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, Rings and Forging and Flash-Welded Ring Stock 64Ni - 5.0Cr - 24.5Mo - 5.5Fe (Alloy W) Solution Heat Treated

AMS5755H (Current)

11/21/2024

This specification covers a corrosion- and heat-resistant nickel alloy in the form of bars, forgings, flash-welded rings, and stock for forging or flash-welded rings

AMS F Corrosion and Heat Resistant Alloys Committee

Microstructure analysis of TIG welded additively manufactured prepared joints of Ni-based superalloys produced by Laser Powder Bed Fusion

2024-01-4050

11/15/2024

ABSTRACT Laser powder bed fusion (L-PBF) of entire assemblies is not typically practical for technical and economic reasons. The build size limitations and high production costs of L-PBF make it competitive for smaller, highly complex components, while the less complex elements of an assembly are manufactured conventionally. This leads to scenarios that use L-PBF only where it’s beneficial and requires integration and joining to form the final product. Today the welding process requires complex welding fixtures and tack welds to ensure correct alignment and positioning of parts for repeatable results. In this paper, both L-PBF and milled weld preparations are presented to simplify Tungsten inert gas (TIG) welding of rotationally symmetrical geometries using integrated features for alignment and fixation. All welds produced in this study passed the highest evaluation group B according to DIN 5817. Citation: Ole Geisen, Tad Steinberg, “Microstructure analysis of TIG welded additively

Geisen, Ole, Steinberg, Tad

2024-01-3744

11/15/2024

ABSTRACT Friction stir welding is a solid state joining technique in which no melting of the metals is involved. The technique is very attractive for aluminum alloys due to the low heat input involved in the process, which leads to improved mechanical properties as compared to conventional fusion welds. In this work, different aluminum series alloys were friction stir welded together. The aluminum alloys consisted of a solid solution/strain hardened aluminum alloy 5083-H131, and precipitation strengthened aluminum alloys 2139-T8 and aluminum 7085-T721. The joint combinations were aluminum alloys 5083-H131 to 7085-T721, aluminum alloys 2139-T8 to 7085-T721, and aluminum alloys 5083-H131 to 2139-T8. Their mechanical properties were analyzed and compared to base metal properties. Optical microscopy was used to analyze the grains in the welds. Good mixing of the different aluminum alloys was optically observed in all of the welds, which lead to good joint properties, opening the

Martinez, Nelson, McDonnell, Martin

MICROSTRUCTURAL ANALYSIS AND CREEP BEHAVIOR OF 25MM THICK FRICTION STIR WELDED AA2139-T8

2024-01-3737

11/15/2024

ABSTRACT Most studies conducted on friction stir welded (FSW) Al alloys are on plates that are 2.5-7 mm thick. However, the U.S. Army utilizes materials that are 25 mm thick and greater for structure and armor. In order to properly apply FSW to Al-Cu-Mg-Ag alloys for use in next generation ground vehicles, data must be generated and available for model and simulation databases. One key type of data is the tensile-creep behavior of FSW AA 2139-T8. Creep is the time dependent, plastic deformation of a material under a constant load, usually observed at a constant temperature where T>0.3Tm. The objective of this study is to provide information regarding the tensile-creep behavior of the stir zone in comparison to the heat affected zone (HAZ) through the depth of the weld. The results from this research provide information on the effect of FSW processing on the microstructure and creep behavior. Pre- and post-deformation samples were analyzed via SEM and TEM and the results are discussed

Okeke, Uchechi, Boehlert, Carl

HIGH MN, HIGH AL STEELS FOR THICK PLATE ARMOR APPLICATIONS

2024-01-3739

11/15/2024

ABSTRACT FeMnAlC alloys exhibit lower density (6.5-7.2 g/cm3) than traditional military steels (7.9 g/cm3) while maintaining similar energy absorption capabilities. Material substitutions in legacy systems must meet existing form/fit/function requirements, limiting opportunities for lightweighting of existing designs. This study examines production and material properties of thick plate with a nominal chemistry of 30% Mn, 9%Al and 1%C, in the wrought condition. Due to the high aluminum and carbon content, there are unique challenges to large scale (45+ ton heat) production versus typical armor steel chemistries. Lab-scale wrought and production material are characterized, comparing microstructure, and mechanical properties. Processing practices including teeming flux and rolling temperature are discussed. The high manganese content of this alloy presents challenges for welding and machining practices, such as limited compatibility of weld wires and substantial work hardening during

Sebeck, Katherine, Toppler, Ian, Rogers, Matt, Limmer, Krista, Cheeseman, Bryan, Howell, Ryan, Herman, William

SIMULATION AND VALIDATION OF METAL-FOAM COOLING DESIGN

2024-01-3425

11/15/2024

ABSTRACT The open-cell metal foams have an internal structure is a web of connected ligaments. Foams are made from pure or alloys of aluminum, nickel, steel, magnesium, titanium and copper. In addition to being light weight, the foams exhibit excellent stiffness-to-weight ratios. Some foams can be resilient materials in harsh environments and have high impact resistance. The foams have high conductivities and large surface area per unit volume. All of these attributes make metal foam an attractive core for heat exchange. For example, cooling of power electronics and for thermal management of ground vehicles can employ metal-foam designs. Numerical simulation of convection heat transfer due to airflow inside commercial aluminum foam is conducted in a commercial numerical package. For validation, actual air temperatures were locally measured inside heated commercial aluminum foam, and cooled by forced air flow using a specially-developed technique. Good agreement between the modeling and

Dukhan, Nihad, SULEIMAN, AHMED S., AL-RAMMAHI, MUNTADHER A.

Compositional Sensitivity of High Mn, High Al Lightweight Steels

2024-01-3815

11/15/2024

ABSTRACT The family of lightweight high Mn, high Al steels (FeMnAl) exhibit lower density (6.5-7.2 g/cm3) than traditional military steels (7.9 g/cm3). These alloys are precipitation hardened, with κ-carbide dominating hardening performance. This carbide has an E21 perovskite structure with a nominal composition of (Fe,Mn)3AlC. In the literature, a number of studies have examined the sensitivity of mechanical properties to changing a single element in the composition. However, the covariance of the major elements has not been systematically explored. In this study, a series of small ingots were prepared according to a two-factor design of experiments, in addition to analysis of previously generated compositions. Methods of measuring alloy composition will be discussed, along with aging kinetics and key mechanical properties. Citation: K. Sebeck, I. Toppler, K. Limmer, D. Field, D. Wagner, A. Gafner, “Compositional Sensitivity of High Mn, High Al Steels”, In Proceedings of the Ground

Sebeck, Katherine, Toppler, Ian, Limmer, Krista, Field, Daniel, Wagner, Daniel, Gafner, Alyssa

Rigorous Accelerated Approach to Thermomechanical Processing Optimization for New Ballistic Protection Alloys

2024-01-3807

11/15/2024

ABSTRACT The armor research and development community needs a more cost-effective, science-based approach to accelerate development of new alloys (and alloys never intended for ballistic protection) for armor applications, especially lightweight armor applications. Currently, the development and deployment of new armor alloys is based on an expert-based, trial-and-error process, which is both time-consuming and costly. This work demonstrates a systematic research approach to accelerate optimization of the thermomechanical processing (TMP) pathway, yielding optimal microstructure and maximum ballistic performance. Proof-of-principle is being performed on titanium alloy, Ti-10V-2Fe-3Al, and utilizes the Hydrawedge® unit of the Gleeble 3800 System (a servo-hydraulic thermomechanical testing device) to quickly evaluate mechanical properties and simulate rolling schedules on small samples. Resulting mechanical property and microstructure data are utilized in an artificial intelligence (AI

Lillo, Thomas, Chu, Henry, Anderson, Jeffrey, Walleser, Jason, Burguess, Victor

FORMING AND WELDING INNOVATIONS FOR ARMOR STEELS

2024-01-3740

11/15/2024

ABSTRACT This paper reviews research that has been conducted to develop inductively assisted localized hot forming bending technologies, and to use standardized welding tests to assess the practicality and potential benefits of adopting stainless based consumables to weld both existing and evolving armor alloys. For the titanium alloy Ti6Al4V it was determined that warming the plate to circa 600°F would improve the materials ductility (as measured by reduction of area) from ~18 to 40% without exposing the material to a temperature at which atmospheric contamination would be significantly deleterious. For the commercial alloy BB and class 1 armor alloy it was found that there was little effect on the charpy impact toughness and the proof strength as a result of processing at 900 °F with either air cool or water quench and there was an added benefit of lower residual stresses in the finished bends compared to cold formed bends. Heating “alloy BB” to 1600 °F followed by water quench

Lawmon, John, Alexandrov, Boian, Duffey., Matthew, Ngan., Tiffany

Investigation of Hot Cracking Phenomena in Light-Weight Armor Steel Based on the FeMnAl-C Alloy System

2024-01-3738

11/15/2024

ABSTRACT The US Army TARDEC has been researching an alternative to current armor steel that is both tough, and light-weight. The studied alloy is based on the Fe-Mn-Al-C system. This study was conducted to investigate and quantify this alloy’s susceptibility to hot cracking phenomena related to casting and welding. Very little research has been done on general weldability of this alloy system, so the results of these tests will be compared to other high Mn steels, and alloys that have undergone cast pin tear testing. Testing will be conducted utilizing button melting tests, autogenous spot welds, and cast pin tear testing. The cast pin tear testing was conducted to measure this alloys susceptibility to weld solidification cracking. The spot welds were used to quantify the susceptibility of the weld heat affected zone (HAZ) to liquation cracking, as well as to observe the solidification structure of the fusion zone. The testing results showed that the FeMnAl system in its current form

Evans, William, Ramirez, Antonio J., Sebeck, Katherine

EVALUATION OF CANDIDATE METHODS FOR WELDING STEEL TO OTHER STRUCTURAL LIGHTWEIGHT METALS

2024-01-3741

11/15/2024

ABSTRACT This paper addresses candidate technologies for attaching steels to selected lightweight materials. Materials of interest here include aluminum and titanium alloys. Metallurgical challenges for the aluminum-to-steel and titanium-to-steel combinations are first described, as well as paths to overcome these challenges. Specific joining approaches incorporating these paths are then outlined with examples for specific processes. For aluminum-to-steel joining, inertia, linear, and friction stir welding are investigated. Key elements of success included rapid thermal cycles and an appropriate topography on the steel surface. For titanium-to-steel joining, successful approaches incorporated thin refractory metal interlayers that prevented intimate contact of the parent metal species. Specific welding methods employed included resistance mash seam and upset welding. In both cases, the process provided both heat for joining and a relatively simple strain path that allowed significant

Gould, Jerry E., Eff, Michael, Namola, Kate

DEVELOPMENT OF A SCALABLE THERMOMECHANICAL PROCESS (TMP) FOR THICK BAINITIC ARMOR STEEL

2024-01-3745

11/15/2024

ABSTRACT A bainite phase-based alloy and associated thermomechanical process were developed to produce (2.5 to over 5 cm) thick armor-grade steel with uniform through-thickness high hardness and strength. The alloy composition and the final-critical (austenite to bainite) isothermal transformation step were specifically designed to utilize a simple and versatile air-cool/quench method to keep a low upfront capital cost and to provide the ability to continuously control the cooling rate in real time, in order to produce maximum volume fraction of bainite phase, and promote uniformly distributed strength and hardness. Final thickness of 1.9 cm and 5.7 cm steel plates were fabricated for characterization, testing and evaluation and found to possess uniform through-thickness hardness between 53 to 55 HRC and dynamic compressive strength of up to 2 GPa

Chu, Henry S., Lillo, Thomas M., Anderson, Jeffrey A., Zagula, Thomas A.

Magnesium Alloy and Silicon Nitrides Composite Study: Synthesis and Abrasive Water Jet Machining Behavior and Optimization

05-18-02-0014

11/15/2024

Related to traditional engineering materials, magnesium alloy-based composites have the potential for automobile applications and exhibit superior specific mechanical behavior. This study aims to synthesize the magnesium alloy (AZ61) composite configured with 0 wt%, 4 wt%, 8 wt%, and 12 wt% of silicon nitride micron particles, developed through a two-step stir-casting process under an argon environment. The synthesized cast AZ61 alloy matrix and its alloy embedded with 4 wt%, 8 wt%, and 12 wt% of Si3N4 are subjected to an abrasive water jet drilling/machining (AJWM) process under varied input sources such as the diameter of the drill (D), transverse speed rate (v), and composition of AZ61 composite sample. Influences of AJWM input sources on metal removal rate (MRR) and surface roughness (Ra) are calculated for identifying the optimum input source factors to attain the best output responses like maximum MRR and minimum Ra via analysis of variant (ANOVA) Taguchi route with L16 design

Venkatesh, R.

SUPERIOR BALLISTIC AND BLAST RESISTANCE IN ATI TITAN 27™ ALLOY WITH A NOVEL DEFORMATION MECHANISM

2024-01-3986

11/15/2024

ABSTRACT α-β titanium alloys are used in armor plate applications due to their capability to defend against ballistic threats while having a 40% lower density than steel. ATI 425® was developed as a cold-deformable alternative to Ti-6Al-4V with similar ballistic properties and improved blast performance owing to the alloy’s higher damage tolerance. ATI Titan 27™ is an evolutionary step forward on ATI 425® Alloy, and is being developed as a higher-performance titanium armor alloy owing to its greater than 10% improvement in strength with similar ductility and formability. Recent work has demonstrated a novel deformation mechanism that explains the improved cold deformation observed in both alloys over Ti-6Al-4V. This mechanism, a twinning of α-phase coinciding with slip in the β-phase, is unique among high-strength titanium alloys. Moreover, twinning is well known to be suppressed with high oxygen content, and ATI Titan 27™ Alloy has one of the highest oxygen targets across high

Foltz, John, Ruiz-Aparicio, Luis, Berry, David, Porter, Rick

Program Overview: Extra-Large, Metal Additive Manufacturing System, Targeted Towards Army Ground Vehicle Systems

2024-01-3924

11/15/2024

ABSTRACT The Applied Science and Technology Research Organization of America (ASTRO America), Ingersoll Machine Tool (Ingersoll), MELD Manufacturing (MELD), Siemens Digital Industries (Siemens), The American Lightweight Materials Manufacturing Innovation Institute (ALMII), and the US Army CCDC-GVSC have partnered to show the feasibility of fabricating very large metal parts using a combination of additive and subtractive manufacturing technologies. The Army seeks new manufacturing technology to support supply chain strategy objectives to replace costly inventories and reduce lead times. While additive manufacturing (AM) has demonstrated production of metallic parts for military applications, the scale of these demonstrations is much smaller than required for large vehicle components and/or complete vehicle hull structures. Leveraging AM for large scale applications requires enhancements in the size, speed, and precision of the current commercially available state-of-the-art equipment

Rodriguez, Ricardo X., Wells, Corrine, Carter, Robert H., LaLonde, Aaron D., Goffinski, Curtis W., Cox, Chase D., Bell, Tim S., Kott, Norbert J., Gorey, Jason S., Czech, Peter A., Hoffmann, Klaus, Holmes, Larry (LJ) R.

LOW DISTORTION TITANIUM ALLOY IN LASER POWDER BED FUSION ADDITIVE MANUFACTURING

2024-01-3988

11/15/2024

ABSTRACT Titanium and its alloys offer superior strength at a fraction of the weight of steel or nickel-based alloys. Some α-β titanium alloys such as Ti-6Al-4V have been widely used in laser powder bed fusion additive manufacturing applications due to the historical cast-wrought data sets and the availability of this alloy in powder form, however this alloy presents challenges during the laser-based printing process of components due to the high residual stress in the material. Alternative β-rich Ti alloys such ATI Titan 23™ can offer superior printability, lower residual stress, and higher mechanical properties than Ti-6Al-4V in additive manufacturing applications. This study covers the assessment of ATI Titan 23™ as an alternative printable Ti alloy and the resulting microstructure, mechanical properties, and residual stress of the printed material. Citation: Garcia-Avila, Foltz, “Low Distortion Titanium Alloy in Laser Powder Bed Fusion Additive Manufacturing System,” In Proceedings

Garcia-Avila, Matias, Foltz, John

MONOCOQUE ALUMINUM STRUCTURE DESIGN FOR LIGHT TACTICAL VEHICLE WITH EMPHASIS ON DEFEATING UNDER BODY BLAST EVENT AND IMPROVING CREW SURVIVABILITY

2024-01-3486

11/15/2024

ABSTRACT In order to defeat under body blast events and improve crew survivability, a monocoque aluminum cab structure has been designed as a drop on solution based on the current M1151A1 (HMMWV) chassis. The structure is comprised of all 5083-H131 Aluminum alloy armor plates with various thicknesses. The structure design consists of the following new features: (1) Robust joining design utilizing interlocking ballistic joints and mechanical interlocking features, (2) unique B-pillar gusset design connects roof & floor with B-pillar & tunnel, and (3) “Double V” underbody shaping design. The TARDEC designed, integrated & built vehicle achieved no crew core body injuries for a vehicle of this weight class and demonstrated meeting the crew survivability objective when subjected to a 2X blast during the live fire underbody blast tests. These efforts help to not only baseline light tactical vehicle capabilities, but also validate the possibility of meeting aggressive blast objectives for

Lee, Chu-Hwa, Lacap, Demetrio M., Keller, Shawn J.

Test the Corrosion Effect on High Hard Steel Armor MIL-DTL-46100 Coated with Stellite 6 Applied by Direct Energy Deposition Method

2024-01-3813

11/15/2024

ABSTRACT The U.S. Army - GVSC Materials Characterization and Failure Analysis team conducted a preliminary study in FY18 to address the issue of galvanic and pitting corrosion of U.S. Army ground vehicle system (GVS) structural surfaces. The objective of this study was to develop a permanent coating solution to supplement the existing corrosion protective coating of zinc rich primer and CARC paint, and extend the lifecycle of the armor. Twenty-five permanent, 0.1 inch layer, additively manufactured (AM) coated coupons of deposited Stellite 6 cobalt alloy on MIL-STD-46100 High Hard (HH) armor steel blocks were produced for cyclic testing using an un-optimized set of parameters. These coupons were subjected to a twenty-four week study in accelerated corrosive conditions of a fog spray chamber alongside primer-CARC coated and uncoated coupons. The resulting study showed no signs of pitting corrosion in the surface of the AM coated coupons, and minimal galvanic corrosion. Citation: I

Toppler, Ian J, Schleh, Daniel C, Romero, Claudio Gutierrez

Detection of Cut-Out in Aluminum Plate Using Ultrasonic Guided Waves: A Finite Element Analysis

01-17-03-0019

11/09/2024

Aluminum alloys serve a critical role in the aerospace industry, accounting for a significant amount of commercial aircraft weight. Despite the growing use of composite materials, aluminum remains important in airframe construction due to its lightweight, cost-effectiveness, and high strength potential. Structural integrity is critical in modern engineering, necessitating early diagnosis and localization of damage. To detect the flaws, cracks, and cut-out in the structures, structural health monitoring (SHM) systems are essential, with non-destructive testing (NDT) methodologies playing critical roles. Among these technologies, ultrasonic guided wave testing (UGWT) has gained popularity because of its capacity to propagate over long distances and detect subsurface faults. This article investigates the use of UGWs to identify cut-outs in aluminum plates. The numerical investigation has been carried out using commercially available finite element software Abaqus. The ultrasonic lamb

Rajput, Arun, Patil, Vaibhav Kailas, Bhosale, Aniket, Yadav, Ritesh, Ghatge, Adityaraj, Pandey, Anand Ji

Titanium Alloy Bars, Forgings, and Forging Stock 6.0Al - 2.0Sn - 4.0Zr - 6.0Mo Solution Heat Treated and Aged

AMS6906D (Current)

11/06/2024

This specification covers a titanium alloy in the form of bars up through 4.000 inches (101.60 mm) in nominal diameter or least distance between parallel sides, inclusive, and maximum cross-sectional area of 32 square inches (206.5 cm2), forgings of thickness up through 4.000 inches (101.60 mm), inclusive, and maximum cross-sectional area of 32 square inches (206.5 cm2), and stock for forging of any size (see 8.6

AMS G Titanium and Refractory Metals Committee

Aluminum Alloy, Plate, 6.2Zn - 1.8Cu - 2.4Mg - 0.13Zr (7010-T7651), Solution Heat Treated, Stress Relieved, and Precipitation Heat Treated

AMS4204E (Current)

11/06/2024

This specification covers an aluminum alloy in the form of plate 0.250 to 5.500 inch (6.35 to 139.70 mm), inclusive, in nominal thickness (see 8.5

AMS D Nonferrous Alloys Committee

Titanium Alloy, Round Bar and Wire, 3AI - 8V - 6Cr - 4Mo - 4Zr, Consumable Electrode Melted, Solution Heat Treated and Cold Drawn

AMS4957H (Current)

11/06/2024

This specification covers a titanium alloy in the form of round bar and wire 0.625 inch (15.88 mm) and under in nominal diameter or thickness (see 8.7

AMS G Titanium and Refractory Metals Committee

Titanium Alloy Sheet, Strip, and Plate, 6Al - 6V - 2Sn, Solution Heat Treated and Aged

AMS4990E (Current)

11/06/2024

This specification covers a titanium alloy in the form of sheet, strip, and plate up through 4 inches (101.6 mm) (see 8.5

AMS G Titanium and Refractory Metals Committee

Forgings, Titanium Alloys Heat-Treated, Finished-Part Properties: Short-Traverse Tensile, Fracture Toughness, and Longitudinal Time-Dependent-Tension

AMS4938B (Current)

11/06/2024

This specification establishes requirements for titanium forgings of any shape or form from which finished parts are to be made (see 2.4.4, 8.3, and 8.6

AMS G Titanium and Refractory Metals Committee

Tantalum Alloy, Bars and Rods, 90Ta - 10W

AMS7848E (Current)

11/06/2024

This specification covers a tantalum alloy in the form of bars and rods up through 3.5 inches (88.9 mm), inclusive (see 8.5

AMS G Titanium and Refractory Metals Committee

Aluminum Alloy Forgings 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7075-T7352) Solution Heat Treated, Stress Relieved by Compression, and Overaged

AMS4147F (Current)

11/06/2024

This specification covers an aluminum alloy in the form of die forgings up to 4 inches (102 mm), inclusive, in thickness and hand forgings up to 6 inches (152 mm), inclusive, in thickness (see 8.6

AMS D Nonferrous Alloys Committee

Titanium Alloy, Sheet and Strip, 4Al - 2.5V - 1.5Fe, Electron Beam Single Melted. Annealed

AMS6949B (Current)

11/06/2024

This specification covers a titanium alloy in the form of sheet and strip up to 0.143 inch (3.63 mm), inclusive, in nominal thickness (see 8.6

AMS G Titanium and Refractory Metals Committee

Wire, Electric, Polyvinyl Chloride Insulated, Copper or Copper Alloy

AS50861C (Current)

11/06/2024

This specification covers polyvinyl chloride insulated single conductor electric wires made with tin-coated copper conductors or silver-coated copper alloy conductors. The polyvinyl chloride insulation of these wires may be used alone or in combination with other insulating or protective materials

AE-8D Wire and Cable Committee

INSERT - CRES HELICAL COIL FINE THREAD, LOCKING (LOW FRICTION SYSTEMS) 3 DIA NOM LENGTH

AS3097B (Current)

11/06/2024

E-25 General Standards for Aerospace and Propulsion Systems

INSERT - CRES HELICAL COIL FINE THREAD, LOCKING (LOW FRICTION SYSTEMS) 2.5 DIA NOM LENGTH

AS3096B (Current)

11/06/2024

E-25 General Standards for Aerospace and Propulsion Systems

Aluminum Alloy, Discontinuously Reinforced Extruded Bar, Rod, Wire and Shapes, (2124A/SiC/25p (0.7 µm) (T1P

AMS4369A (Current)

10/28/2024

This specification covers a discontinuously reinforced aluminum alloy (DRA) made by mechanical alloying 2124A aluminum powder and silicon carbide particulate (SiC). It is produced in the form of extruded bar, rod, wire, and shapes with cross section inclusive of 1-inch (25.4-mm) diameter or less (see 8.7

AMS D Nonferrous Alloys Committee

Aluminum Alloy, Plate (7140-T7451) 6.6Zn - 1.8Cu - 2.0Mg - 0.10Zr Solution Heat Treated, Stress Relieved, and Overaged

AMS4401C (Current)

10/28/2024

This specification covers an aluminum alloy in the form of plate 4.001 to 10.000 inches (101.60 to 254.00 mm), inclusive, in nominal thickness

AMS D Nonferrous Alloys Committee

Static Analysis of Aluminum Alloy Ingot/Zirconium Diboride Composites for Automotive Applications

05-18-01-0007

10/16/2024

The aim of this work is to develop a composite material and investigate its mechanical characteristics especially suited for automotive applications, and finite element analysis (FEA) of fabricated composite is carried out to examine the mechanical behavior of composites. Utilizing aluminum alloy ingot (LM13) as the matrix material and zirconium diboride (ZrB2) as reinforcement, this work creates composites with improved mechanical and physical properties by accounting impact, tensile, compression, and hardness behavior. FEA is used to examine the increasing behavior of material properties for various volume segments of reinforcement (2.5, 5, 7.5, and 10 wt%) that are supplied to the matrix to determine an acceptable volume percentage of composite based on their input features. In FEA, the impact, tensile, compression, and hardness characteristics of the composite model are investigated by considering von Mises stress, equivalent elastic strain, and total deformation. The experimental

Vijayan, S. N., Chelladurai, Samson Jerold Samuel, Saiyathibrahim, A., Infant Jegan Rakesh, A. J., Thriveni, K., Preethi, V., Jatti, Vijaykumar S., Karthik, S., Balaji, K., Saranya, S.

Titanium Alloy Bars, Forgings and Forging Stock 3.0Al - 2.5V Annealed

AMS6940C (Current)

10/11/2024

This specification covers a titanium alloy in the form of bars up through 1.000 inch (25.40 mm) in diameter or least distance between parallel sides, inclusive, forgings of thickness up through 1.000 inch (25.40 mm), inclusive, high-strength fastener stock up through 1.250 inch (31.75 mm), inclusive, and stock for forging of any size (see 8.7

AMS G Titanium and Refractory Metals Committee

Aluminum Alloy, Discontinuously Reinforced Extruded Bar, Rod, Wire and Shapes, 2124A/SiC/25p (3 µm) - T1P

AMS4379A (Current)

10/11/2024

This specification covers a discontinuously reinforced aluminum alloy (DRA) made by mechanical alloying 2124A aluminum powder and silicon carbide (SiC) particulate. It is produced in the form of extruded bar, rod, wire, and shapes with cross section inclusive of 1-inch (25.4-mm) diameter or less (see 8.7

AMS D Nonferrous Alloys Committee

AS70054 STREAMER, WARNING

AS70054-1 (Current)10/10/2024

Scope is unavailable

Engine and Airframe Technical Standards Committee (TSC)

Aluminum Alloy, Extrusions 4.0Cu - 1.3Mg - 0.60Mn (2026-T3511) Solution Heat Treated and Stress Relieved by Stretching

AMS4338C (Current)

10/08/2024

This specification covers an aluminum alloy in the form of extruded bars, rods, and profiles (shapes) with a maximum cross-sectional area of 25 square inches (161 cm2), a maximum circle size of 12 inches (305 mm), and a nominal thickness up to 3.250 inches (82.54 mm), inclusive (see 8.6

AMS D Nonferrous Alloys Committee

Spacers and Washers, Procurement Specification for, Metric

MA1784A (Historical)

10/03/2024

This specification covers metric aircraft quality spacers for use as positioners for tubes, flat washers for use as load spreaders, galling protection of adjacent surfaces and or material compatibility, and key or tab washers for use as locks for bolts, nuts, and screws

E-25 General Standards for Aerospace and Propulsion Systems

Aerospace & Defense Technology: October 2024

24AERP1010/03/2024

A New Look at Ignition: Refining Our Understanding of Combustion Dynamics in Gun Chambers How High-Reliability Capacitors Support Electrical Power in Military Vehicles How to Get Advanced Air Mobility into the Sky Making the Rounds in Aerospace: Tooling and Techniques for Discs, Blisks and Rings Rising Star Awards: Women in Engineering Aerospace Winner Heather Cummings Beyond the Beam: The Impact of Coaxial Cables on Phased Array Technology Cutting-Edge Drone Killer Radio Wave Weapon developing at Pace Using Artificial Intelligence to Find the Polymers of the Future Georgia Tech researchers are using artificial intelligence to accelerate materials discovery. Machine Learning Unlocks Secrets to Advanced Alloys An MIT team uses computer models to measure atomic patterns in metals, essential for designing custom materials for use in aerospace, biomedicine, electronics, and more

Synthesis and Characterization of AA6351/SiC Composites Using Ball Milling Combined with Hot Extrusion

05-18-01-0003

10/03/2024

In this investigation, AA6351 alloy matrix composites with a larger volume proportion of SiC (20 wt%) were fabricated and tested for microstructure and mechanical behavior. Composites were hot extruded from mechanically milled matrix and reinforcements. Hot extrusion uniformly distributed reinforcements in the matrix and strengthened phase interaction. Mechanical ball milling causes AA6351 powder to become more homogeneous, reducing the mean particle size from 38.66 ± 2.31 μm to 23.57 ± 2.31 μm due to particle deformation. The micrograph shows that the SiC particles are equally dispersed in the AA6351 matrix, avoiding densification and reinforcing phase integration issues during hot extrusion. In hot extrusion, SiC particles are evenly distributed in the matrix, free of pores, and have strong metallurgical bonds, resulting in a homogenous composite microstructure. SiC powders and mechanical milling increase microhardness and compressive strength, giving MMC-A 54.9% greater than AA6351

Saiyathibrahim, A., Murali Krishnan, R., Jatti, Vinaykumar S., Jatti, Ashwini V., Jatti, Savita V., Praveenkumar, V., Balaji, K.

Air Cycle Air Conditioning Systems for Air Vehicles

AS4073B (Current)

10/03/2024

This SAE Aerospace Standard (AS) defines the requirements for air cycle air conditioning systems used on military air vehicles for cooling, heating, ventilation, and moisture and contamination control. General recommendations for an air conditioning system, which may include an air cycle system as a cooling source, are included in MIL-E-18927E and JSSG-2009. Air cycle air conditioning systems include those components which condition high temperature and high pressure air for delivery to occupied and equipment compartments and to electrical and electronic equipment. This document is applicable to open and closed loop air cycle systems. Definitions are contained in Section 5 of this document

AC-9 Aircraft Environmental Systems Committee

BOLT, TEE HEAD, CHAMFERED - CRES, UNS S66286, 130 KSI MIN, .2500-28 UNJF-3A

AS9433B (Current)

10/03/2024

E-25 General Standards for Aerospace and Propulsion Systems

Environmental Control Systems Terminology

ARP147E (Current)

10/03/2024

This ARP provides the definition of terms commonly used in aircraft environmental control system (ECS) design and analysis. Many of the terms may be used as guidelines for establishing standard ECS nomenclature. Some general thermodynamic terms are included that are frequently used in ECS analysis, but this document is not meant to be an inclusive list of such terms

AC-9 Aircraft Environmental Systems Committee

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