TY - JOUR
T1 - Novel Co-rich high entropy alloys with superior tensile properties
AU - Wei, Daixiu
AU - Li, Xiaoqing
AU - Heng, Weicheng
AU - Koizumi, Yuichiro
AU - He, Feng
AU - Choi, Won Mi
AU - Lee, Byeong Joo
AU - Kim, Hyoung Seop
AU - Kato, Hidemi
AU - Chiba, Akihiko
N1 - Funding Information:
This work was primarily supported by the ‘Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development’ project, Tohoku University, Japan. The work was partially supported by the Swedish Research Council (Grant No. 2016-00236), and the DFT calculations were performedonresources provided by theSwedish National Infrastructure for Computing (SNIC) at the National Supercomputer Centre. Meanwhile, this work was partially supported by the Future Material Discovery Project of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Korea (NRF-2016M3D1A1023383).
Publisher Copyright:
© 2018, © 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
PY - 2019/2/1
Y1 - 2019/2/1
N2 - We developed a series of Co-rich CoxCr25(FeNi)75−x (x = 35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co35Cr25Fe20Ni20 and Co45Cr25Fe15Ni15 alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc → hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys.
AB - We developed a series of Co-rich CoxCr25(FeNi)75−x (x = 35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co35Cr25Fe20Ni20 and Co45Cr25Fe15Ni15 alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc → hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys.
KW - High entropy alloy
KW - deformation twinning
KW - martensitic transformation
KW - metastable
KW - stacking fault energy
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U2 - 10.1080/21663831.2018.1553803
DO - 10.1080/21663831.2018.1553803
M3 - Article
AN - SCOPUS:85061558192
SN - 2166-3831
VL - 7
SP - 82
EP - 88
JO - Materials Research Letters
JF - Materials Research Letters
IS - 2
ER -