Effects of Si additions on microstructures and mechanical properties of VNbTiTaSix refractory high-entropy alloys

被引：36
作者：
Xu, Z. Q. [1 ,2 ]
Ma, Z. L. [1 ,2 ]
Tan, Y. [1 ,2 ]
Wang, M. [1 ,2 ]
Zhao, Y. [1 ,2 ]
Cheng, X. W. [1 ,2 ]
机构：
[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[2] Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 900卷
基金：
中国国家自然科学基金;
关键词：
High-entropy alloys; Room temperature mechanical properties; High-temperature mechanical properties; Microstructure; PRINCIPAL ELEMENT ALLOYS; SILICIDE PRECIPITATION; LOW-DENSITY; ZR; BEHAVIOR; STRENGTH; ALUMINUM; DESIGN; NB3SI; HEAT;
D O I：
10.1016/j.jallcom.2021.163517
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
(VNbTiTa)100-xSix (x = 0, 2.5, 5, 10) refractory high-entropy alloys (RHEAs) are investigated in this paper. The equal molar VNbTiTa RHEA exhibits a room-temperature yield strength of 704 MPa and good compressive ductility (fracture strain > 50%). Si additions can introduce BCC+M5Si3 eutectic formed at inter-dendrite areas, and when the Si content reaches 10% in mole, extra bulk M3Si phase was observed. The precipitated silicides greatly improve the yield strength up to 1671 MPa. As the temperature increases, the strengthening effect of silicide becomes weaker, and almost disappeared at 1200 degrees C. Nanoscale silicides can precipitate during high-temperature deformations. (VNbTiTa)97.5Si2.5 RHEA possesses an excellent combination of room-temperature ductility 34% and yield strength 505 MPa at 1000 degrees C. (c) 2021 Elsevier B.V. All rights reserved.
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页数：9
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