Achieving high strength and ductility in high-entropy alloys via spinodal decomposition-induced compositional heterogeneity

被引:54
作者
Chen, Yujie [1 ,2 ]
Fang, Yan [1 ,2 ]
Wang, Ruixin [3 ]
Yu, Qian [1 ]
Bai, Shuxin [3 ]
Tang, Yu [2 ,3 ]
机构
[1] Zhejiang Univ, Ctr Electron Microscopy, Dept Mat Sci & Engn, Hangzhou 310027, Peoples R China
[2] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China
[3] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Peoples R China
来源
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2023年 / 141卷
关键词
Bcc high-entropy alloys; Spinodal decomposition; Compositional heterogeneity; Dislocation loops; High strength; Ductility; COMPLEX CONCENTRATED ALLOYS; DISLOCATION LOOPS; TENSILE; MICROSTRUCTURE; DEFORMATION; ORIGIN;
D O I
10.1016/j.jmst.2022.09.018
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The compositional heterogeneity in high-entropy alloys (HEAs) has been reported to be an inherent en-tity, which significantly alters the mechanical properties of materials by tuning the variation of lattice resistance for dislocation motion. However, since the body-centered cubic (BCC) structure is not close -packed, the change of lattice resistance is less sensitive to the normal concentration wave compared to that in face-centered cubic (FCC) structured materials. In this work, we selected a refractory bcc HEAs TiZrNbTa for the matrix and added a small amount of Al to facilitate the special spinodal decomposition structure. In particular, (TiZrNbTa)98.5Al1.5 displayed a typical basket-weave fabric morphology of spinodal decomposition structure with a characteristic periodicity of-8 nm and had an optimal combination of strength and ductility (the yield strength of 1123 +/- 9 MPa and ductility of-20.7% +/- 0.6%). It was de-termined that by doing in situ TEM mechanical testing, the plastic deformation was dominated by the formation and operation of dislocation loops which provided both edge and screw components of dislo-cations. The synergetic effect of the remarkable chemical heterogeneity created by the spinodal decompo-sition and the spreading lattice distortion in high entropy alloys is quite effective in tuning the mobility of different types of dislocations and facilitates dislocation interactions, enabling the combination of high strength and ductility.(c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码:149 / 154
页数:6
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