The origin of negative stacking fault energies and nano-twin formation in face-centered cubic high entropy alloys

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• 作者：Y.H. Zhang ; Y. Zhuang ; A. Hu ; ^{alicehu@cityu.edu.hk} ; J.J. Kai ; C.T. Liu
• 关键词：High entropy alloy ; Stacking fault energy ; First-principles ; Phase stability
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：96-99
• 全文大小：931 K
• 卷排序：130

文摘

The secrets behind the exceptional mechanical properties of high entropy alloys (HEAs) at cryogenic temperatures have drawn much attention in recent years. In this work, the negative stacking fault energy of FCC CrNiCo and FeCrNiCo alloys are disclosed by first-principles calculations. We found that the negative SFEs originate from the thermodynamic metastability of FCC stacking sequence and heavily influenced by the local atomic environment, which in turn affects the formation of stacking faults and nano-twins.