Microstructural evolution and mechanical behaviour of Nb-10Hf-15W alloy doped with Si

被引：0
作者：
Liao, Junhua [1 ]
Yu, Fan [1 ]
Wei, Zhenhe [1 ]
Sha, Jiangbo [1 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Mat & Performance, Beijing 100191, Peoples R China
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2021年 / 37卷 / 14期
基金：
中国国家自然科学基金;
关键词：
Nb alloys; silicide; microstructure; mechanical properties; failure mode; FRACTURE-TOUGHNESS; TERNARY ALLOYS; NB; STRENGTH; ADDITIONS; ROOM; TI; COMPOSITES; STRESS;
D O I：
10.1080/02670836.2021.1987695
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructural evolution and mechanical properties of Nb-10Hf-15W-(0/1/3/5)Si (at.-%) alloys were investigated. The as-cast 0Si and 1Si alloys had a single Nb solid solution (Nb-SS) phase, while the 3Si and 5Si alloys consisted of Nb-SS matrix and the eutectic of Nb-SS plus Nb3Si. After heat treatment, the microstructure contained primary Nb-SS and Nb-SS + alpha-Nb5Si3 eutectoid in 3Si and 5Si alloys. Fracture toughness of as-cast and heat-treated samples at room temperature monolithically decreased with increasing Si content. However, the alpha-Nb5Si3 phase improved compressive strength of the Nb-SS alloy at 1250 and 1350 degrees C, with no degradation in the ductility or formability of the Nb-SS/Nb5Si3 microstructure. Finally, the failure mechanisms of the Nb-SS/alpha-Nb5Si3 microstructure at room and high temperatures were discussed.
引用
收藏
页码：1174 / 1186
页数：13
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