Journal
SCRIPTA MATERIALIA
Volume 130, Issue -, Pages 96-99Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2016.11.014
Keywords
High entropy alloy; Stacking fault energy; First-principles; Phase stability
Categories
Funding
- CityU internal grant [9610336]
- National Natural Science Foundation of China [11605148]
- Hong Kong GRF [CityU 9042204, CityU 11209314]
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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. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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