Deactivating deformation twinning in medium-entropy CrCoNi with small additions of aluminum and titanium

被引：38
作者：
Slone, C. E. [1 ,2 ]
LaRosa, C. R. [2 ]
Zenk, C. H. [1 ,2 ]
George, E. P. [3 ,4 ]
Ghazisaeidi, M. [2 ]
Mills, M. J. [1 ,2 ]
机构：
[1] Ohio State Univ, Ctr Electron Microscopy & Anal, Columbus, OH 43212 USA
[2] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA
[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[4] Univ Tennessee, Mat Sci & Engn Dept, Knoxville, TN 37996 USA
来源：
SCRIPTA MATERIALIA | 2020年 / 178卷
基金：
美国国家科学基金会;
关键词：
Medium- and high-entropy alloys; CrCoNi alloy; TWIP steel; Deformation twinning; Work-hardening; STACKING-FAULT ENERGY; INDUCED PLASTICITY; MECHANICAL-PROPERTIES; CRITICAL STRESS; ALLOY; EVOLUTION; TWINS; TRANSFORMATION; TEMPERATURE; REFINEMENT;
D O I：
10.1016/j.scriptamat.2019.11.053
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High strain-hardening rates in equiatomic CrCoNi and other multi-principal element alloys have been attributed to deformation twinning. This work shows that small additions of Al and Ti to a CrCoNi alloy deactivate deformation twinning with only minor changes to uniform elongation and ultimate tensile strength. The initial microstructure is free of chemically ordered (Al,Ti)-rich precipitates after solutionizing and quenching. Tensile properties for the alloy are reported and compared to equiatomic CrCoNi, and the post-deformation microstructure is assessed. Density functional theory calculations indicate that energetically unfavorable Al-Al bonds may discourage shearing via partial dislocations, which are necessary for twinning to occur. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：295 / 300
页数：6
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