Enhanced strength-ductility balance of the (CoCrFeNiMn)95.2Al3.2Ti1.6 high-entropy alloy by co-precipitation of the B2 and sigma phases

被引：13
作者：
Yang, Guanghui [1 ]
Kang, Jiyeon [1 ]
Kim, Jin-Kyung [1 ]
Park, Joo Hyun [1 ]
机构：
[1] Hanyang Univ, Dept Mat Sci & Chem Engn, Ansan 15588, South Korea
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 873卷
基金：
新加坡国家研究基金会;
关键词：
High entropy alloy; Co-precipitation; Mechanical properties; Sigma phase; B2; phase; ULTRA-HIGH STRENGTH; MECHANICAL-PROPERTIES; NANOSCALE PARTICLES; STABILITY; PRECIPITATION; STRAIN; NANOCRYSTALLINE; MICROSTRUCTURE; KINETICS; BEHAVIOR;
D O I：
10.1016/j.msea.2023.145039
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The present work investigated the effect of the co-precipitation of the B2 and & sigma; phases on the mechanical properties of the (CoCrFeNiMn)95.2Al3.2Ti1.6 high entropy alloy subjected to two-step annealing. The single-step annealed sample at 900 & DEG;C only showed B2 precipitates. Further annealing at 650 and 750 & DEG;C led to the co precipitation of & sigma; and B2 particles. The sizes and fractions of & sigma; and B2 particles increased with increasing annealing temperature. The sample subjected to the second annealing at 750 & DEG;C, with large sizes and fractions of co-precipitated & sigma; and B2 particles, exhibited high strength with maintaining moderate ductility (YS: 561 MPa, UTS: 1005 MPa, TE: 26%). The superior mechanical properties of the sample subjected to the second annealing at 750 & DEG;C could be owing to the co-precipitation hardening, back stress strengthening, joint activation of dislocation plasticity and deformation twinning. The present work offers a novel microstructure design to optimize the strength-ductility balance of high-entropy alloys via the co-precipitation of & sigma; and B2 particles.
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页数：8
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