Effects of torsional deformation on the microstructures and mechanical properties of a CoCrFeNiMo0.15 high-entropy alloy
Effects of torsional deformation on the microstructures and mechanical properties of a CoCrFeNiMo0.15 high-entropy alloy
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DOI：
10.1080/14786435.2017.1369191
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发表时间：
2017-08
影响因子：
1.6
通讯作者：
Wenqian Wu;Lin Guo;B. Liu;S. Ni;Yong Liu;M. Song
中科院分区：
文献类型：
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作者：
Wenqian Wu;Lin Guo;B. Liu;S. Ni;Yong Liu;M. Song
摘要 研究了扭转变形对CoCrFeNiMo0.15高熵合金显微组织和力学性能的影响。由于梯度扭转应变，扭转变形产生梯度微结构分布。位错活动和变形孪生主导了扭转变形过程。随着扭转等效应变的增加，微观结构的演变可描述如下：（1）形成平行于{1 1 1}型滑移面轨迹的堆积位错； (2)泰勒格子的形成； (3)形成高密度位错壁； (3)微带和变形孪晶的形成。极高的变形应变（应变断裂）导致波状滑移的激活。拉伸强度对扭转变形非常敏感，并且随着扭转角度的增加而显着增加。
Abstract The effects of torsional deformation on the microstructures and mechanical properties of a CoCrFeNiMo0.15 high-entropy alloy have been investigated. The torsional deformation generates a gradient microstructure distribution due to the gradient torsional strain. Both dislocation activity and deformation twinning dominated the torsional deformation process. With increasing the torsional equivalent strain, the microstructural evolution can be described as follows: (1) formation of pile-up dislocations parallel to the trace of {1 1 1}-type slip planes; (2) formation of Taylor lattices; (3) formation of highly dense dislocation walls; (3) formation of microbands and deformation twins. The extremely high deformation strain (strained to fracture) results in the activation of wavy slip. The tensile strength is very sensitive to the torsional deformation, and increases significantly with increasing the torsional angle.