This specification defines limits of variation for determining acceptability of composition of cast and wrought corrosion and heat-resistant steels and alloys, maraging and other highly alloyed steels, and iron alloy parts and materials acquired from a producer.

AMS F Corrosion and Heat Resistant Alloys Committee

Nickel-Copper Alloy, Corrosion Resistant, Tubing, Seamless 67Ni - 31Cu Annealed

AMS4574F (Current)

6/15/2026

This specification covers a corrosion-resistant nickel-copper alloy in the form of seamless tubing.

AMS F Corrosion and Heat Resistant Alloys Committee

Carburizing and Heat Treatment of Carburizing Grade Steel Parts

AMS2759/7F (Current)

6/15/2026

This specification, in conjunction with the general requirements for steel heat treatment covered in AMS2759, establishes the requirements and procedures for three classes of gas, vacuum, liquid, and low-pressure carburizing (LPC) and related heat treatment of parts fabricated from carburizing-grade steels. Parts made from steels other than those specified in the detail specifications may be heat treated in accordance with the applicable requirements using processing temperatures, times, and other parameters recommended by the material producer. This specification does not cover pack carburizing.

AMS B Finishes Processes and Fluids Committee

Aluminum Alloy Castings, 7.0Si - 0.58Mg - 0.15Ti (E357.0-T6), Solution and Precipitation Heat Treated

AMS4288A (Current)

6/15/2026

This specification covers an aluminum alloy in the form of castings (see 8.10).

AMS D Nonferrous Alloys Committee

Steel, Bars, Forgings, Mechanical Tubing, and Forging Stock, 1.4Mn - 1.5Si - 0.30Cr - 1.8Ni - 0.40Mo (0.23 - 0.28C) (HY-TUF), Premium Aircraft-Quality, Consumable Electrode Vacuum Melted

AMS6425G (Current)

6/15/2026

This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, and mechanical tubing 225 square inches (1452 cm2) and under in cross-sectional area and forging stock of any size.

AMS E Carbon and Low Alloy Steels Committee

BOLT, TEE HEAD - AMS5662, CHAMFERED, .2500-28 UNJF-3A (STRESS RUPTURE RESISTANT)

AS3410C (Current)

6/12/2026

E-25 General Standards for Aerospace and Propulsion Systems

STUD, LOCKED IN, KEY LOCKED, UNS S66286, 140 KSI/1200 °F LIGHTWEIGHT, SELF-BROACHING KEYS

AS3543B (Current)

6/10/2026

E-25 General Standards for Aerospace and Propulsion Systems

Unidirectional Carbon Fiber Tape Epoxy Repair Prepreg, Vacuum Curing Part 1 - General Requirements

AMS6885/1 (Current)

6/10/2026

AMS6885/1 gives information about the technical requirements and qualification procedure for unidirectional carbon fiber tape epoxy repair prepreg capable of curing under vacuum for repair of carbon fiber reinforced epoxy structures. The repair system includes an epoxy film adhesive to be applied in a co-bonding process with the prepreg for solid laminate and sandwich bonding.

AMS CACRC Commercial Aircraft Composite Repair Committee

Design-Driven Sustainability of Automotive Components: A Comparative LCA from Conventional to Metal and Composite Additive Manufacturing

2026-37-0037

6/9/2026

The increasing pressure to decarbonize manufacturing systems is pushing industry beyond conventional lightweighting strategies toward material and process paradigms, capable of delivering functional performance with radically lower environmental impact. In this context, polymer-based composite Additive Manufacturing (AM) offers an underexplored yet highly promising pathway for sustainable production of load-bearing components. This study presents a preliminary comparative cradle-to-gate Life Cycle Assessment (LCA) of a Formula SAE brake pedal, assessing the environmental transition from conventional sheet metal fabrication and finishing operations of Aluminum 7075-T6 to additive manufacturing solutions, with specific focus on Carbon-Fiber-Reinforced Polymer (CFRP) composites. Two topology-optimized designs, respectively for Powder Bed Fusion (PBF) in AlSi10Mg and Material Extrusion (MEX) in Polyethylene Terephthalate Glycol with Carbon Fiber (PETG-CF) are compared to conventional

Dalpadulo, Enrico, Russo, Mario, Apté MD, Raphaëlle, Leali, Francesco

Investigation of the Combustion of Stearic Acid-Coated Pure Aluminum Powder as Additives in Biodiesel and Diesel Blends

04-19-02-0010

6/8/2026

In the present study, research was conducted to increase the combustion efficiency in a diesel engine by adding 100 and 200 ppm aluminum powder to diesel and biodiesel (produced from 10% spent coffee ground oil and 90% waste cooking oil) blends. Aluminum powder is a flammable metal. Due to this feature, it has been used as an additive to liquid fuels in many studies in the literature. In general, it has been reported that thermal efficiency increases with the addition of aluminum particles. However, the high explosion sensitivity of aluminum can affect its stable combustion. In addition, Al is a metal that can be easily oxidized. Therefore, coating aluminum is considered a good solution. Stearic acid has been suggested in the literature as a suitable material for coating aluminum. In this study, stearic acid, a saturated fatty acid, was used to coat aluminum particles. Stearic acid is a good surfactant, hydrophobic substance, and plasticizer. It is also a more environmentally friendly

Kül, Volkan Sabri, Akansu, Selahaddin Orhan, Sarıtaş, Mehmet

Quantifying Life Cycle Environmental Impact of Emerging Aluminum High-Pressure Die Cast (HPDC) Mega-Castings Replacing Stamped Steel Solutions

13-07-01-0004

6/4/2026

Over the last few years, there has been an uptick in the exploration and implementation of aluminum high-pressure die casting (HPDC) mega-castings as replacements for conventional stamped steel parts in vehicles. This trend is expected to increase with common justifications, including claims of reduced costs and lower environmental impacts associated with the replacement of dozens of individual parts with a single casted piece, along with reduced demands on associated tooling and machinery. However, the data and literature to support these claims are limited and at times contradictory, with some studies showing increased costs and energy demands for mega-casting technologies. This study presents the results of a literature review and a gate-to-gate life cycle inventory (LCI) adapted from conventional HPDC aluminum casting unit processes that may be used to quantify potential life cycle global warming potential (GWP), cumulative energy demand (CED), and other environmental impacts of

Sebastian, Brandie, Balzer, Russ

WASHER, KEY - 90°, LOCKING, CRES, UNS S32100

AS9581D (Current)

6/3/2026

E-25 General Standards for Aerospace and Propulsion Systems

Polymer vs. Metal Seals: A Comparison In Critical Space Systems

26AERP06_03

6/1/2026

Sealing systems in space applications must perform reliably under demanding conditions in engineering: cryogenic temperatures, vibration, leakage control, ultra-high vacuum, ionizing radiation, abrasive particulates, and repeated thermal cycling. Each factor strains conventional sealing technologies. In combination, they can rapidly cause failure in systems where margins are unforgiving and maintenance is impossible. As spacecraft architectures evolve toward longer operational lifetimes and broader mission profiles, sealing requirements continue to tighten. Launch vehicles, satellites, and exploration platforms now operate across wider temperature ranges and in contact with more aggressive propellants and media. As a result, both metal seals and engineered polymer alternatives are evaluated-and selected-against increasingly specific, measurable performance criteria.

Steel, Corrosion-Resistant, Wire, 18Cr - 9.0Ni (302), Spring Temper

AMS5688N (Current)

6/1/2026

This specification covers a corrosion-resistant steel in the form of wire.

AMS F Corrosion and Heat Resistant Alloys Committee

Investigation of Aluminium Alloy Composites Reinforced with Zirconium oxide and Solid Lubricant Attributes for Brake and Clutch Components of Aircrafts

2026-26-0752

6/1/2026

For brake and clutch components of aircraft vehicles which require higher mechanical strength and wear resilient, light-weight aluminium composites were developed infusing solid lubricant. In this study, hybrid composites were developed using powder metallurgy route with aluminum alloy AA356 and various amounts of zirconium oxide (ZrO2) (0, 5, 10, 15, and 20 wt.%) as reinforcements. A solid lubricant hexagonal boron nitride (hBN) at a fixed 5 wt.% is considered. Following the appropriate ASTM guidelines, the specimens were mechanically characterized by measuring their density, porosity, micro-hardness, compression strength, impact strength, and flexural strength, among other properties. The findings showed that the composites' mechanical and physical behaviour were greatly affected by the inclusion of ZrO2. Porosity increased as a result of particle clustering and interfacial voids, while density increased gradually as ceramic content increased. Consistently increasing ZrO2 addition

Senthilkumar, N.

Wear Resilience Characteristics of Silicon Nitride Strengthened AZ31 Magnesium Composite

2026-26-0740

6/1/2026

To develop magnesium matrix composites, ceramic silicon nitride (Si3N4) particles are added to the magnesium (AZ31) matrix at 2 wt.%. The composite is produced via disintegrated melt deposition vacuum-stir-casting procedure. Microstructural studies reveal the presence of Si3N4 particles and their uniform spreading. An L9 orthogonal array, planned using Taguchi’s experimental design, is selected for three wear parameters; axial load (AL), rotational speed (RS), and time duration (TD) with trials as per the G99 standard in the pin-on-disc apparatus to assess the wear resilient of the composite. Experimental results show an increase in axial stress, and wear loss (WL) increases dramatically. Because the area of contact shrinks as RS increases, WL diminishes dramatically. When the AL is low, the friction coefficient (CoF) increases, and when the AL is large, CoF drops. When the RS is increased, CoF decreases. To optimize multiple responses effectively, the TOPSIS (Technique for Order

Senthilkumar, N., Dhinakar Raj, C K

Lightweight Magnesium Nanocomposites with Enhanced Wear Resistance for Landing Gear Application

2026-26-0751

6/1/2026

This study systematically evaluated the wear resilient performance of AZ61 magnesium alloy reinforced with 15 wt.% SiC and diverse amounts of multi-walled carbon nanotubes (MWCNTs) under dry sliding circumstances adopting pin-on-disc apparatus (ASTM G99). To identify the influence of factors like sliding speed (SS) (1-3 m/s), axial load (AL) (10-30 N), and MWCNT concentration (0-3 wt.%) that affect tribological performance, experiments were developed using a Central Composite Design (CCD) under Response Surface Methodology (RSM). SEM micrographs revealed a dispersion optimum near 2 wt.% MWCNT, where CNTs anchor to SiC and bridge the α-Mg matrix, while 3 wt.% shows agglomerates and micro-voids. Findings showed that wear loss (WL) and friction coefficient (CoF) was greatly amplified by increasing AL owing to localized heating and contact stresses. A compacted tribolayer was formed by increasing SS, which decreased WL but marginally raised the CoF. At low AL (10 N), SS (2.09 m/s), and

Senthilkumar, N.

Predictive Model and Analysis of the Resultant Force in the Dry Machining of Mg-4Zn/Si ₃ N ₄ Nanocomposites

2026-26-0762

6/1/2026

The development of lightweight materials for use in aerospace and automotive applications is extremely significant. Magnesium (Mg)-based alloys and composites are good candidate materials from the perspective of low density, good specific strength, and abundance. The Mg-4Zn alloy is one such alloy, which is a lightweight, biocompatible, and eco-friendly Mg-based alloy. In spite of these advantages, there is a strong need and scope to improve its wear resistance and mechanical properties. Mg-4Zn nanocomposites with Si3N4 reinforcements (a biocompatible bioceramic) are hypothesized to possess superior properties. Microstructural analysis of the vacuum stir-cast nanocomposites confirms grain refinement and a consequent increase in microhardness with an increase in Si3N4 reinforcement wt.%. The addition of Si3N4 reinforcement to improve the properties of the Mg-4Zn alloy could introduce challenges in machining. To make products from the nanocomposites, machining them with minimal

N, Anand, Shaju, Tony M, G, Nagamalleswara Rao, D, Bijulal, K, Jayaprakash Reddy, K, Vijayan, Chaman, Joji J

Electrical Harnessing in Satellite Launch Vehicles of ISRO – Methods for Sustainable, Safe and Reliable Systems

2026-26-0779

6/1/2026

The electrical harness system of satellite launch vehicles functions as the backbone of spacecraft avionics; inter connecting subsystems through complex networks of wires and connectors. An electrical harness is a group of wires bunched together and terminated in connectors. The common insulations used for launch vehicle applications include PTFE, Polyimide, ETFE and TKT. The connectors used are of aerospace grade and connectors tailored for space applications. With over 5000 connectors and 200 km of cables constituting nearly 20% of vehicle mass, the design, fabrication, and sustainability of these systems are critical. The insulations of connectors inserts or the wires are critical for the durability of harness elements. Nevertheless, these insulations are non-expendable and pose disposal challenges and some releases toxic gases when burned or due to vacuum outgassing phenomenon. Also, the cadmium plating which is often used for the environmental resistance of connector shells

K S, Nithish, TR, Binny, D S, Praveen Kumar

Reducing Test Campaigns through Advanced Yield Surface Modeling for New Aircraft Metal Grades

2026-26-0755

6/1/2026

Qualification of new aerospace alloys requires extensive mechanical testing to capture anisotropy and ensure reliable performance under complex loading conditions. This process is costly and time-consuming, particularly with emerging manufacturing routes such as additive manufacturing. Advanced yield surface prediction offers a route to reduce test campaigns by linking microstructural features to macroscopic constitutive models. In this work, Digimat is employed as a multi-scale material modeling platform to generate yield surfaces of polycrystalline metals using computational homogenization. Representative volume elements (RVEs) are constructed from experimental texture and grain morphology data, and their response under multiaxial loading is simulated using a crystal plasticity framework. The computed yield loci are then fitted with phenomenological functions (e.g. Yld2000-2D), enabling calibration of anisotropic yield models from virtual testing. As a case study, an AA6016-T4 sheet

Padhan, Manas, Uppaluri, Rohith, Lemoine, Guerric, Soni, Ganesh

Aluminum Alloy Sheet, 2.7Cu - 2.2Li - 0.12Zr (2090-T83), Solution Heat Treated, Cold Worked, and Precipitation Heat Treated

AMS4251D (Current)

5/26/2026

This specification covers an aluminum alloy in the form of sheet 0.040 to 0.249 inch (1.02 to 6.32 mm) in nominal thickness (see 8.7).

AMS D Nonferrous Alloys Committee

Study on Impact Resistance of Sandwich-Structured Battery Protection Panels

2026-99-1728

5/22/2026

With new energy vehicles developing rapidly, battery safety, as an important part of the impact on the range of new energy vehicles and vehicle safety, has become the focus of attention. The battery pack protection plate is a core component to protect the battery, its performance needs not only impact resistance, but also lightweight, honeycomb sandwich structure with its excellent energy absorption characteristics and weight reduction performance by the battery pack protection plate performance research. At present, the core-to-face sheet interaction in conventional sandwich structures subjected to impact loads has not been fully elucidated, and the quantitative characterization of damage is insufficient, so this paper aims to optimize the lightweight impact-resistant structure by exploring the synergistic energy dissipation mechanism between the high-strength core material and the steel plate. The study combines theory and simulation, adopting ideal rigid-plastic film theory to

Zhang, Guanghao, Zhang, Mingming, Luo, Changjie, Zhou, Jun, Zhang, Fengqiang, Yu, Wenze, Li, Jiongfeng, Guo, Qingrong

Design And Analysis of Low-Temperature Liquid Nitrogen Tank Car

2026-99-1712

5/22/2026

The design and analysis of the wave plate of the tank body of the low-temperature liquid nitrogen tank car are carried out. According to the design method of the empirical formula, the 0.43 MPa low-temperature mobile liquid nitrogen tank body wave plate with the working temperature of -196°C to -178°C is optimized. According to the analysis and design standards, the stress distribution law of the mobile liquid nitrogen tank body under the forward impact condition is analyzed by the method of numerical analysis. The results show that the stress value will gradually increase near the junction of the tank body and the support, and the parts such as the head, the pad, the angle steel ring, and the Z3848 glass steel pipe meet the requirements of the analysis and design standards. At the same time, the first six orders of the natural mode vibration frequency of the tank body are analyzed, which provides a reliable and effective data analysis for the optimization design of the low-temperature

Ding, Xuqiang, Ni, Yiwei, Gu, Chen, Yan, Dongdong, Xu, Zhiquan, Wang, Qi

Columbium (Niobium) Alloy Bars, Rods, and Extrusions 10Hf - 1.0Ti, Recrystallization Annealed

AMS7857D (Current)

5/20/2026

This specification covers a columbium (niobium) alloy in the form of bars, rods, and extrusions.

AMS G Titanium and Refractory Metals Committee

Columbium (Niobium) Alloy Sheet, Strip, and Plate, 10Hf - 1.0Ti

AMS7852D (Current)

5/19/2026

This specification covers a columbium (niobium) alloy in the form of sheet, strip, and plate.

AMS G Titanium and Refractory Metals Committee

An Analytical Piecewise-Linear Joint Stiffness Model for Predicting Load Distribution in Multi-Bolt Metal–Composite Joints

05-19-04-0028

5/14/2026

Accurate prediction of load distribution in multi-bolt metal–composite joints relies heavily on high-fidelity modeling of single-bolt joint stiffness. Current models, however, inadequately capture the complex effects of bolt–hole clearance, including delayed load take-up and reduced bearing chord stiffness, as well as multi-interface friction interactions. To overcome these limitations, quasi-static tests were conducted on single-bolt, single-lap aluminum–CFRP joints with varying clearances. By integrating experimental findings with an analysis of the load-transfer mechanisms, we identified five distinct loading states and formulated corresponding analytical load-deformation equations along with explicit transition criteria, culminating in a novel piecewise-linear stiffness model. Enhancements over traditional tri-linear models encompass: (a) subdivision of the transition region into separate local and global slip phases, facilitating an accurate representation of asynchronous slip

Liu, Haolong, Sun, Qingping, Liu, Yang, Zhao, Qi, Liu, Yue

Titanium Alloy Welding Wire, 6Al - 4V, Extra Low Interstitial, Environment Controlled Packaging

AMS4956J (Current)

5/14/2026

This specification covers a titanium alloy in the form of wire for welding filler metal (see 8.5).

AMS G Titanium and Refractory Metals Committee

Aluminum Alloy, Heat-Resistant, Castings 5.0Cu - 1.5Ni - 0.25Mn - 0.25Sb - 0.25Co - 0.20Ti - 0.20Zr (203.0-T6) Solution Heat Treated and Precipitation Heat Treated

AMS4225F (Current)

5/14/2026

This specification covers an aluminum alloy in the form of castings.

AMS D Nonferrous Alloys Committee

Evaluation of Mechanical Tensile Properties on TIG-Welded AISI 304L Austenitic Stainless Steel Using Principal Component Analysis

05-19-04-0027

5/14/2026

The reliability of welded joints is a vital factor in modern manufacturing, directly affecting product performance and durability. This study investigates methods to enhance the mechanical and metallurgical quality of butt joints in AISI 304L stainless steel welded by the gas tungsten arc (GTA) process. A systematic experimental design was implemented using the Taguchi method with an L9 orthogonal array, considering welding current, gas flow rate, and travel speed as the main parameters. To determine overall weld performance, the joints were characterized by measuring ultimate tensile strength (UTS), yield strength, percentage elongation, and examining their microstructural morphology. An experimental strategy based on the Taguchi approach has been implemented. The welding performance of the material was investigated, and the process parameters were optimized using multiresponse optimization through principal component analysis (PCA), incorporating an orthogonal array design, signal-to

Ghosh, Nabendu, Roy, Angshuman

Aluminum Alloy, Extruded Profiles (2196-T8511), 2.9Cu - 1.7Li - 0.4Mg - 0.4Ag - 0.10Zr, Solution Heat Treated, Stress Relieved by Stretching, and Artificially Aged

AMS4416C (Current)

5/14/2026

This specification covers an aluminum-lithium alloy in the form of extruded profiles 0.040 to 1.000 inch (1.00 to 25.40 mm), inclusive, in nominal thickness (see 8.5).

AMS D Nonferrous Alloys Committee

Steel, Corrosion- and Heat-Resistant, Bars, Wire, Forgings, Mechanical Tubing, Rings and Stock for Forging, Flash-Welded Rings or Heading, 13Cr - 2.0Ni - 3.0W (Greek Ascoloy), Annealed

AMS5616P (Current)

5/9/2026

This specification covers a corrosion- and heat-resistant steel in the form of bars, wire, forgings, mechanical tubing, flash-welded rings, and stock for forging, flash-welded rings, or heading.

AMS F Corrosion and Heat Resistant Alloys Committee

Unidirectional Carbon Fiber Tape Epoxy Repair Prepreg, Vacuum Curing Part 5 - Material Specification for Unidirectional Carbon Fiber Tape Epoxy Prepreg for Repair and Film Adhesive for Repair, 120 to 145 °C (250 to 290 °F) Curing

AMS6885/5 (Current)

5/7/2026

AMS6885/5 is the Material Specification (MS) which defines the requirements of a unidirectional carbon fiber tape epoxy repair prepreg capable of curing under vacuum for repair of carbon fiber reinforced epoxy structures. It also defines the requirements of an epoxy film adhesive to be applied in a co-bonding process with the prepreg for solid laminate and sandwich bonding.

AMS CACRC Commercial Aircraft Composite Repair Committee

Hardness and Conductivity Inspection of Wrought Aluminum Alloy Parts

AMS2658E (Current)

5/6/2026

This specification establishes hardness and electrical conductivity acceptance criteria for finished or semifinished parts made from wrought aluminum alloys after heat treatment (see 8.6).

AMS D Nonferrous Alloys Committee