Effects of minor B additions on tensile strength, fracture toughness and oxidation resistance of Nb-Si based alloys

被引：13

作者：

Sun, Guangxin ^{[1
]}

Jia, Lina ^{[1
]}

Wang, Yu ^{[1
]}

Jin, Zuheng ^{[1
]}

Zhang, Hu ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL | 2022年 / 32卷 / 02期

关键词：

Nb-Si based Alloys; Directional solidi fication; Tensile strength; Fracture toughness; Oxidation resistance; MECHANICAL-PROPERTIES; BORON ADDITION; SOLID-SOLUTION; MICROSTRUCTURE; TI; MO; HF; IMPROVEMENT; PHASE; COMPOSITES;

D O I：

10.1016/j.pnsc.2021.11.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of minor additions of B on microstructure, ambient tensile strength, fracture toughness and high temperature oxidation resistance of Nb-Si based alloys were investigated. The added contents were designed as 0.05, 0.10 and 0.20 at.%. The results show constituent phases in 0.05B and 0.20B alloys were Nbss, alpha-Nb5Si3; while only 0.10B alloy consisted of gamma-Nb5Si3. Minor B was prioritized into Nbss and redundant one dissolved into silicide enhanced volume fraction of the silicide. With increasing concentrations of boron, the microstructure was refined at first and then coarsened, while the tensile strength was enhanced remarkably. Compared with other two alloys, the 0.10B alloy containing gamma-Nb5Si3 shows both the best fracture toughness and oxidation resistance. The important roles of gamma-Nb5Si3 in balancing overall properties are emphasized.

引用

页码：248 / 258

页数：11

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