Ta-induced strengthening of CoCrNi-AlTi medium-entropy alloys via nanoscale heterogeneous coherent precipitate

被引：4

作者：

Ding, Zhiyi ^{[1
]}

Xie, Jiangtao ^{[1
]}

Wang, Tong ^{[4
]}

Chen, Aiying ^{[1
]}

Gan, Bin ^{[2
]}

Song, Jinchao ^{[3
]}

机构：

[1] Univ Shanghai Sci & Technol, Sch Mat & Chem, 516 Jungong Rd, Shanghai 200093, Peoples R China

[2] Cent Iron & Steel Res Inst, Beijing Key Lab Adv High Temp Mat, Beijing 100081, Peoples R China

[3] Univ Shanghai Sci & Technol, Shidong Hosp Shanghai, Dept Anesthesiol, 999 Shiguang Rd, Shanghai, Peoples R China

[4] Univ Shanghai Sci & Technol, Inst Photon Chips, Shanghai 200093, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 891卷

基金：

中国国家自然科学基金;

关键词：

Medium -entropy alloys; Ta-induced strengthening; Multiscale grains; Coherent precipitate; Nanolamellae; DEFORMATION;

D O I：

10.1016/j.msea.2023.145942

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nano-precipitate strengthened medium-entropy alloys (MEAs) with good strength elongation combinations are crucial for structural applications. This study demonstrated Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The density of coherent nanolamellar phases in (CoCr0.5-Ni1.5)86Al10Ti4 alloys can be increased with recrystallisation heat treatment, although this enhances the ductility of the alloy by up to 26.57 % the strength attained is only 733 MPa. However, addition of 2 at. % of Ta to (CoCr0.5Ni1.5)86Al10Ti4 MEAs enhances the mechanical properties, and the resulting yield strength, ultimate tensile strength, and acceptable elongation are 1385 MPa, 1690 MPa, and 7.44 %, respectively at room tem-perature. Thus, Ta-addition and aging treatments increase the yield stress by 89 %. This is attributed to the coexistence of nanoscale lamellar, heterogeneous, and continuous precipitates in the incompletely recrystallized grains. Therefore, this study serves as a reference for developing correlations between the microstructure evo-lution and property design of L12-gamma ' precipitation-strengthened MEAs.

引用

页数：12

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