Comparative studies on densification behavior, microstructure, mechanical properties and oxidation resistance of Mo-12Si-10B and Mo3Si-free Mo-26Nb-12Si-10B alloys

被引：10
作者：
Yang, Tao [1 ]
Guo, Xiping [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2019年 / 84卷
基金：
中国国家自然科学基金;
关键词：
Mo-Nb-Si-B alloy; Densification behavior; Mechanical property; Oxidation resistance; MO-SI-B; FRACTURE-TOUGHNESS; NB; DEFORMATION; IMPROVEMENT; STABILITY; CERAMICS; SILICIDE; POWDER;
D O I：
10.1016/j.ijrmhm.2019.104993
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Two bulk Mo-Si-B based alloys (Mo-12Si-10B and Mo-26Nb-12Si-10B (at.%), abbreviated as 0Nb and 26Nb alloy respectively) were fabricated by mechanical alloying and then hot pressing. Comparative studies were carried out on the densification behavior, microstructure, room-temperature fracture toughness, elevated temperature compression and oxidation resistance of these two alloys. The results showed that alloy ONb was composed of (Mo), Mo3Si and Mo5SiB2, while alloy 26Nb was free of Mo3Si and had higher (Mo) content and a little gamma Nb5Si3. Compared to the alloy ONb, alloy 26Nb presented better compactibility, higher room-temperature fracture toughness (8.84 +/- 0.17 vs. 6.77 +/- 0.20 MPa.m(1/2)) and elevated temperature compression strength (851.7 +/- 11.7 vs. 644.2 +/- 10.2 MPa) but worse oxidation resistance.
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页数：8
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