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Tunable mechanical property and strain hardening behavior of a single-phase CoFeNi_2V_(0.5)Mo_(0.2) high entropy alloy

机译:单相CoFeNi_2V_(0.5)Mo_(0.2)高熵合金的可调力学性能和应变硬化行为

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摘要

A large variety of mechanical properties have been achieved in a single-phase CoFeNi_2V_(0.5)Mo_(0.2) high entropy alloy (HEA) with various thermo-mechanical treatments. The HEA always exhibits an excellent strength-ductility synergy after different annealing processes. In particular, the material with fully recrystallized microstructure displays a yield strength of 485 MPa and a high ductility of over 60%, superior to most conventional alloys and HEAs. Results of microstructural analysis indicate that the dislocation dominated deformation mechanism involving dislocation multiplication and interactions through successive planar slip and cross slip serves to enhance the strain hardening capacity, which delays the fracture of the alloy and contributes to the excellent strength and ductility combination.
机译:在具有各种热机械处理的单相CoFeNi_2V_(0.5)Mo_(0.2)高熵合金(HEA)中,已经实现了多种机械性能。在不同的退火工艺之后,HEA始终表现出出色的强度-延展性协同作用。特别是,具有完全重结晶组织的材料显示出485 MPa的屈服强度和超过60%的高延展性,优于大多数常规合金和HEA。显微组织分析结果表明,位错占主导的变形机理涉及位错的倍增以及通过连续的平面滑动和交叉滑动的相互作用,从而增强了应变硬化能力,延迟了合金的断裂,并有助于实现优异的强度和延性组合。

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