层错能
材料科学
高熵合金
可塑性
堆积
分子动力学
变形机理
极限抗拉强度
合金
叠加断层
变形(气象学)
工作(物理)
化学物理
位错
复合材料
热力学
微观结构
计算化学
化学
物理
有机化学
作者
Tengfei Zheng,Jiecheng Lv,Yuan Wu,Hong‐Hui Wu,Shaofei Liu,Jianguo Tang,Meisa Zhou,Hui Wang,Xiongjun Liu,Suihe Jiang,Zhaoping Lü
摘要
Tailoring stacking fault energy (SFE) is an effective way for enhancing mechanical properties of certain high entropy alloys (HEAs) such as the prototype Cantor alloy. However, the underlying mechanism, especially the atomistic origins for the enhanced plasticity and strength, is still unclear. In this work, we performed molecular dynamics simulations to investigate the mechanical behavior of CoxNi40−xCr20Fe20Mn20 (x = 10, 20, and 30 at. %) HEAs under tensile loading. The results show that the SFE decreases with the increase in Co concentration and favors the formation of continuous stacking fault networks on which multiple plastic deformation carriers including stacking faults, dislocations, twins, and martensitic transformation were sequentially activated. The activation and complex interaction of these multiple carriers mainly contribute to the improved plasticity, and the increased stair-rod dislocations result in the enhanced strength in Co30Ni10Cr20Fe20Mn20 HEA. The current findings may be important for the understanding of SFE effects at the atomistic scale and also shed light on designing of high-performance HEAs.
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