Orientation-dependent lattice rotation and phase transformation in an additively manufactured high-entropy alloy

被引:1
作者
Bajaj, D. [1 ]
Feng, A. H. [2 ,3 ]
Qu, S. J. [2 ,3 ]
Li, D. Y. [4 ]
Chen, D. L. [1 ]
机构
[1] Toronto Metropolitan Univ, Dept Mech Ind & Mechatron Engn, Toronto, ON M5B 2K3, Canada
[2] Tongji Univ, Sch Mat Sci & Engn, Shanghai 201804, Peoples R China
[3] Tongji Univ, Shanghai Key Lab D&A Met Funct Mat, Shanghai 201804, Peoples R China
[4] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2H5, Canada
来源
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2025年 / 227卷
基金
加拿大自然科学与工程研究理事会; 中国国家自然科学基金;
关键词
Electron backscatter diffraction; High-entropy alloy; Grain rotation; Phase transformation; Schmid factor; Quasi in-situ observations; SEVERE PLASTIC-DEFORMATION; ANISOTROPIC GRAIN-GROWTH; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; SUPERPLASTIC DEFORMATION; BOUNDARY; BEHAVIOR; SEGREGATION; ELONGATION; DUCTILITY;
D O I
10.1016/j.jmst.2024.10.054
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The rapidly increasing scientific interest in 3D-printed high-entropy alloys (HEAs) necessitates the understanding of their deformation mechanisms. Here, we present the grain rotation behavior of a nearly equiatomic CrMnFeCoNi HEA fabricated with laser-beam powder bed fusion via quasi in-situ electron backscatter diffraction (EBSD) observations during compressive deformation. The rotation paths of grains can be predicted via a new lattice reorientation factor (mA), defined as the average of primary and secondary slip Schmid factors. The grains that initially have their ( 111 ) directions oriented close to the loading direction with low-to-intermediate mA values tend to rotate towards the ( 101 ) pole. The grains initially oriented in the center of inverse pole figures with high mA values develop multiple rotation paths pointing away from the ( 001 ) pole. The cube-oriented grains with their ( 001 ) directions close to the loading direction undergo face-centered cubic (FCC)-to-hexagonal close-packed (HCP) phase transformation due to the activation of octahedral slip involving multiple slip systems. This transformation can be well elucidated via a modified parameter, defined as the average of four maximum Schmid factors on each of four {111} slip/twinning planes in FCC crystals. The findings provide new insights into the underlying mechanisms for deformation-induced grain rotation and phase transformation, and help pave the way for developing advanced HEAs via transformation-induced plasticity. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
引用
收藏
页码:11 / 25
页数:15
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