Abstract This study focuses on a quantitative analysis of dislocation accumulation after cold plastic deformation and mechanical properties of FeNiCoCrMn and TiNbHfTaZr high entropy alloys (HEAs) which are single phase fcc and bcc solid solutions, respectively. In order to study the role of compositional complexity from unary to quinary compositions on dislocation accumulation and mechanical properties after plastic deformation, the single solid solution phase forming sub-alloys of the two HEAs were investigated. All studied samples revealed a large plastic deformability under cold-rotary swaging process by 85–90% area reduction without intermediate annealing. The dislocation density of all studied samples, determined by Williamson-Hall method on synchrotron X-ray diffraction patterns, were between 1014 - 1015 m−2 dependent on the alloy composition. The level of dislocation density after plastic deformation is not only affected by the number of constituent element but the lattice distortion and intrinsic properties in terms of stacking fault energy, modulus misfit, and melting point also impact the dislocation storage. The level of dislocation density determines the level of mechanical properties because of a resistance to dislocation motions. The hardness and yield compressive strength of the studied samples are proportional to the level of dislocation density.

中文翻译：

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高熵合金体系中位错密度和力学性能的成分复杂性依赖性

摘要 本研究重点对分别为单相 fcc 和 bcc 固溶体的 FeNiCoCrMn 和 TiNbHfTaZr 高熵合金 (HEAs) 冷塑性变形后位错积累和力学性能进行定量分析。为了研究从一元到五元成分的复杂性对塑性变形后位错积累和力学性能的作用，研究了两种高热合金的单一固溶相形成亚合金。所有研究的样品在冷旋锻工艺下都显示出较大的塑性变形能力，在没有中间退火的情况下，面积减少了 85-90%。所有研究样品的位错密度，由威廉姆森霍尔方法在同步加速器 X 射线衍射图上确定，取决于合金成分，介于 1014 - 1015 m-2 之间。塑性变形后位错密度的水平不仅受组成元素数量的影响，而且晶格畸变和层错能、模量失配和熔点方面的固有特性也会影响位错存储。由于位错运动的阻力，位错密度的水平决定了机械性能的水平。所研究样品的硬度和屈服抗压强度与位错密度水平成正比。和熔点也会影响位错存储。由于位错运动的阻力，位错密度的水平决定了机械性能的水平。所研究样品的硬度和屈服抗压强度与位错密度水平成正比。和熔点也会影响位错存储。由于位错运动的阻力，位错密度的水平决定了机械性能的水平。所研究样品的硬度和屈服抗压强度与位错密度水平成正比。