10/3/2023 0 Comments High entropy alloys![]() Microstructures and mechanical properties of Al xCrFeNiTi 0.25 alloys. Towards strength-ductility synergy through the design of heterogeneous nanostructures in metals. Instabilities and ductility of nanocrystalline and ultrafine-grained metals. Optimization of strength and ductility in nanocrystalline and ultrafine grained metals. ![]() Mechanical properties of nanocrystalline materials. The conflicts between strength and toughness. Microstructures and properties of high-entropy alloys. Fundamental electronic structure and multiatomic bonding in 13 biocompatible high-entropy alloys. A novel ultrafine-grained high entropy alloy with excellent combination of mechanical and soft magnetic properties. Structure and mechanical properties of B2 ordered refractory AlNbTiVZr x ( x = 0–1.5) high-entropy alloys. Effect of Al content on structure and mechanical properties of the Al xCrNbTiVZr ( x = 0 0.25 0.5 1) high-entropy alloys. Effect of aluminum on the microstructure and properties of two refractory high-entropy alloys. Microstructure and properties of aluminum-containing refractory high-entropy alloys. Interstitial atoms enable joint twinning and transformation induced plasticity in strong and ductile high-entropy alloys. Metastable high-entropy dual-phase alloys overcome the strength-ductility trade-off. Ultrastrong ductile and stable high-entropy alloys at small scales. Microstructure and wear behavior of Al xCo 1.5CrFeNi 1.5Ti y high-entropy alloys. The ultrahigh charpy impact toughness of forged Al xCoCrFeNi high entropy alloys at room and cryogenic temperatures. Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures. A fracture-resistant high-entropy alloy for cryogenic applications. A critical review of high entropy alloys and related concepts. Carbothermal shock synthesis of high-entropy-alloy nanoparticles. Nanostructured high-entropy alloys with multiple principal elements: Novel alloy design concepts and outcomes. ![]() Our work therefore provides a strategy for hierarchical nanostructured HEA formation by composition design considering enthalpy and entropy interplay. Enthalpy analysis and simulation study reveal the phase partition process during cooling induced by an enthalpy-driven order-disorder transition while the order parameters illustrate the strong ordering in (Ni,Co)(Al,Ti)-rich B2 phase and high entropy mixing in less interactive FeCrCo-rich A2 phase. As a result, the FeCrCoAlTi 0.5Ni 1.5 HEA with this unique hierarchical nanostructure exhibits the best combination of strength and plasticity, i.e., a 2-fold increase in compressive strength (2.60 GPa) and significant enhancement of plastic strain (15.8%) as compared with the original FeCrCoAlTi 0.5 HEA. The strong enthalpic interaction between (Ni,Co) and (Al,Ti) pairs in FeCrCoAlTi 0.5Ni x ( x = 0.5–1.5) induced phase partitions into B2 (ordered phase, hard) matrix and A2 (disordered phase, soft) precipitates, resulting in a hierarchical structure of B2 grains and sub-grains of near-coherent A2 nanodomains (∼ 12.5 nm) divided by A2 interdendritic regions. Herein we report using composition design (i.e., enthalpy engineering) to create hierarchical, nanostructured HEAs as demonstrated by adding Ni into FeCrCoAlTi 0.5 HEA. However, the construction of heterogeneous nanostructured HEAs remains elusive and can involve delicate processes that are not practically scalable. Heterogeneous nanostructured metals are emerging strategies for achieving both high strength and ductility, which are particularly attractive for high entropy alloys (HEAs) to combine the synergistic enhancements from multielement composition, grain boundaries, and heterogeneity effects.
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