Browse Topic: Copper alloys
A study led by Tohoku University, Iwate University, The Japan Aerospace Exploration Agency (JAXA), National Astronomical Observation of Japan, Tokyo City University, and Kyoto University developed a novel copper-based alloy that exhibits a special shape memory effect at temperatures as low as -200 °C. Shape memory alloys can be deformed into different shapes when cold, but will revert back to their original shape when heated (as if “remembering” their default state, like memory foam). This exciting new alloy has the potential to be used for space equipment and hydrogen-related technologies, where challenging, cold environments below -100 °C are the norm.
A new study analyzes the use of shape memory alloys in developing thermally driven actuators for spacecraft operating space exploration missions. Tohoku University, Sendai City, Japan A study led by Tohoku University, Iwate University, The Japan Aerospace Exploration Agency (JAXA), National Astronomical Observation of Japan, Tokyo City University, and Kyoto University developed a novel copper-based alloy that exhibits a special shape memory effect at temperatures as low as −200 °C. Shape memory alloys can be deformed into different shapes when cold, but will revert back to their original shape when heated (as if “remembering” their default state, like memory foam). This exciting new alloy has the potential to be used for space equipment and hydrogen-related technologies, where challenging, cold environments below −100 °C are the norm. Previously studied shape memory alloys using Ni-Ti could not maintain their shape memory ability below −20 °C, despite their otherwise practical characteristics. In contrast, the known existing shape memory alloys that can actually operate below −100 °C aren't suitable for practical implementation. This study met the challenge of finding the first functional actuator material capable of large work output at temperatures below −100 °C. Actuators are components that turn some sort of input into mechanical energy (movement). They can be found not only in machines bound for outer space, but in everyday devices all around us.
U.S. Army researchers, in collaboration with academic partners, invented a stronger copper that could help advance defense, energy and aerospace industries thanks to its ability to endure unprecedented temperature and pressure extremes. Extreme materials experts at the U.S. Army Combat Capabilities Development Command (DEVCOM) Army Research Laboratory built on a decade of scientific success to develop a new way to create alloys that enable Army-relevant properties that were previously unachievable. An alloy is a combination of a metal with other metals or nonmetals.
Army and academic researchers have created stronger, more durable copper that could advance military systems. U.S. Army Combat Capabilities Development Command, Army Research Laboratory, Adelphi, MD U.S. Army researchers, in collaboration with academic partners, invented a stronger copper that could help advance defense, energy and aerospace industries thanks to its ability to endure unprecedented temperature and pressure extremes. Extreme materials experts at the U.S. Army Combat Capabilities Development Command (DEVCOM) Army Research Laboratory built on a decade of scientific success to develop a new way to create alloys that enable Army-relevant properties that were previously unachievable. An alloy is a combination of a metal with other metals or nonmetals. Along with researchers at Arizona State University, Lehigh University and Louisiana State University, ARL produced a nanocrystalline copper-tantalum-lithium alloy that can conduct electricity and heat like copper while demonstrating incredible strength and durability even at extremely high temperatures. Copper on its own has excellent heat and electricity conduction but doesn't do well under extreme conditions needed in operational environments.
Electrochemical machining (ECM) is a highly efficient method for creating intricate structures in materials that conduct electricity, regardless of their level of hardness. Due to the growing demand for superior products and the necessity for quick design changes, decision-making in the manufacturing industry has become increasingly intricate. The preliminary intention of this work is to concentrate on Cupronickel and suggest the creation of an Adaptive Neuro-Fuzzy Inference System (ANFIS) model for the purpose of predictive modeling in ECM. The study employs a Taguchi-grey relational analysis (GRA) methodology to attain multi-objective optimization, with the target of maximizing material removal rate, minimizing surface roughness, and simultaneously achieving precise geometric tolerances. The ANFIS model suggested for Cupronickel provides more flexibility, efficiency, and accuracy compared to conventional approaches, allowing for enhanced monitoring and control in ECM operations. Moreover, the study investigates the use of Cupronickel in automotive applications, emphasizing its crucial function in industries that demand resilient materials in harsh settings. The experimental validation has confirmed a strong correlation between the projected results and the actual performance, hence confirming the effectiveness of the ANFIS-based strategy.
Electrochemical machining (ECM) is a highly efficient method for creating intricate structures in materials that conduct electricity, irrespective of their hardness. Due to the increasing demand for superior products and the necessity for quick design modifications, decision-making in the manufacturing sector has become progressively more difficult. This study focuses on Cupronickel and suggests creating predictive models to anticipate performance metrics in ECM through regression analysis. The experiments are formulated based on Taguchi's principles, and a multiple regression model is utilized to deduce the mathematical equations. The Taguchi approach is employed for single-objective optimization to ascertain the ideal combination of process parameters for optimizing the material removal rate. The proposed prediction technique for Cupronickel is more adaptable, efficient, and accurate in comparison to current models, providing enhanced monitoring capabilities. The updated models have been verified, demonstrating a robust link between empirical data and projected results.
Prior to 1950, use of the helicopter for evacuation was extremely limited, as military top brass often considered it a worthless contraption; thus, rescue was uncertain at best for downed pilots and wounded soldiers stranded behind enemy lines. However, this all changed in Korea, where twelve U.S. Army helicopters from three detachments, working in tandem with seven, newly created Mobile Army Surgical Hospital (MASH) units, would fundamentally change the Army's medical-evacuation doctrine forever. Using several models of the Bell H-13, the Hiller H-23, and the Sikorsky H-5 and H-19, this small band of courageous pilots pushed themselves and their aircraft to their limits, transporting 21,212 critically wounded soldiers for life-saving surgery to various MASH units, cutting the fatality rate from World War II in half. Adopting the 3rd Air Rescue Squadron's motto, "That Others May Live," these pilots and their helicopters were affectionately known to the wounded as "Angels of Mercy."
This study delves into the innovative realm of synthesizing surface alloyed materials by utilizing copper-based metamorphic powders subjected to high-intensity electron beam irradiation. The process involves depositing metamorphic particles onto a stainless-steel substrate, and subsequently exposing the assembly to a powerful electron beam, resulting in the development of distinct surface alloyed layers. A notable advancement was achieved by introducing a second layer of metamorphic powders over the existing alloyed layer, followed by further treatment with the electron beam. The alloyed layers, characterized by a volumetric concentration ranging from 60 to 67%, exhibited a fascinating phenomenon— the formation of abundant borate crystals with the chemical formula Al2.56Fe1.75Ni0.84. This crystal presence significantly elevated the hardness of the surface alloyed layers, showcasing an impressive five to sevenfold increase compared to the substrates. Importantly, the alloyed layers demonstrated remarkable thermal stability, successfully enduring a rigorous test at 450 degrees Celsius. The subsequent Vickers hardness measurement, registering at 300 VHN, underscores the substantial and enduring hardness achieved. Beyond these core findings, this study sheds light on the potential of alloyed-surface materials in demanding applications requiring robust heat resistance and exceptional wear resistance. The methodological synergy of metamorphic powders and electron beam irradiation serves as a promising avenue for the development of advanced materials with heightened mechanical properties. Furthermore, this research opens avenues for future investigations into the specific structural and compositional attributes contributing to the observed material enhancements.
Skoltech engineers have used a 3D printer to fabricate — and investigate the mechanical characteristics of — samples of bronze-steel alloys previously unknown to materials science. Blending the distinct properties of bronze and steel, the novel alloys could be used to manufacture combustion chambers for aircraft and rocket engines. These would benefit from both steel’s ability to withstand extreme temperatures and bronze’s capacity to conduct heat away from the chamber.
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