Enhancement of Strength and Plasticity by Nanoprecipitation Strengthening and Stacking Fault Deformation in a High Entropy Alloy

被引：0
|
作者：
Liyuan Liu
Yang Zhang
Zhongwu Zhang
Mingyu Fan
Junpeng Li
Jihong Han
Lixin Sun
Peter K. Liaw
Ian Baker
机构：
[1] Harbin Engineering University,Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering
[2] State Key Laboratory of Metal Materials for Marine Equipment and Application,Department of Materials Science and Engineering
[3] The University of Tennessee,Thayer School of Engineering
[4] Dartmouth College,undefined
来源：
High Entropy Alloys & Materials | 2023年 / 1卷 / 1期
关键词：
High entropy alloy; Interstitial carbon; Precipitation strengthening; Multiple deformation mechanisms; Synergistic effect;
D O I：
10.1007/s44210-022-00011-7
中图分类号：
学科分类号：
摘要：
Precipitation strengthening can effectively improve the strength of high entropy alloys (HEAs), but usually severely reduces the ductility. In this study, a new interstitial carbon-doped HEA with a nominal composition of Ni33.5(CoFe)55V5Nb5C1.5 at.% was developed. The HEA exhibits a high yield strength of 1244 MPa, ultimate tensile strength of 1553 MPa and excellent elongation of ~ 30%. The stacking fault energy of the matrix is affected by the precipitation of L12-Ni3Nb, which enhances the stacking fault (SF)-induced deformation. Since the Taylor lattice domains are subdivided by the SF networks, the mean free path of dislocation is reduced. The enhanced strain-hardening ability leads to a good combination of strength and ductility.
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页码：143 / 164
页数：21
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