Journal
SCRIPTA MATERIALIA
Volume 165, Issue -, Pages 39-43Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.02.018
Keywords
High-entropy alloy; Stacking fault energy; Phase stability; Deformation twinning; Martensitic transformation
Categories
Funding
- 'Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development' project, Tohoku University, Japan
- Core Research Cluster of Materials Science Fusion Research project [J180002408]
- Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research, Tohoku University [18G0424]
- Swedish Research Council [2016-00236]
- Future Material Discovery Project of the National Research Foundation of Korea (NRF) - Ministry of Science and ICT of Korea [NRF-2016M3D1A1023383]
- Swedish Research Council [2016-00236] Funding Source: Swedish Research Council
- Forte [2016-00236] Funding Source: Forte
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The equiatomic CoCrMnNiFe high-entropy alloy (HEA) has attracted much attention owing to its exceptional mechanical properties. Here, we designed novel face-centered cubic (fcc) phase Co-rich non-equiatomic CoCrMnNiFe HEAs with tensile properties superior to the counterparts, derived from lowering stacking fault energy (SFE) via modifying constituent concentrations. The decrease of Mn, Ni, Fe meanwhile increase of Co, Cr concentrations does reduce the SFE value, based on ab initio and thermodynamics calculations. Hereinto, Co35Cr20Mn15Ni15Fe15 and Co(35)Cr(25)Mh(15)Ni(15)Fe(10) HEAs overcame the strength-ductility trade-off, contributing to twinning-induced plasticity (TWIP) or transformation-induced plasticity (TRIP) effects, respectively. The present study sheds light on developing high performance HEAs. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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