Study of the effects of Zr addition on the microstructure and properties of Nb-Ti-Si based ultrahigh temperature alloys

被引：73

作者：

Qiao, Yanqiang ^{[1
]}

Guo, Xiping ^{[1
]}

Zeng, Yuxiang ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

INTERMETALLICS | 2017年 / 88卷

基金：

中国国家自然科学基金;

关键词：

Silicides; Oxidation; Fracture toughness; Microstructure; Electron microscopy scanning; MECHANICAL-PROPERTIES; OXIDATION BEHAVIOR; FRACTURE-TOUGHNESS; CR ADDITIONS; AL; HF; COMPOSITES; RESISTANCE; MO; TA;

D O I：

10.1016/j.intermet.2017.04.008

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：

The effects of alloying with Zr on the microstructure, mechanical and oxidation properties of Nb-Ti-Si based ultrahigh temperature alloys have been investigated in this study. The microstructures of the all alloys were comprised of primary gamma(Nb,X)(5)Si-3 blocks, Nbss and eutectic colonies, and the additions of Zr do not affect the microstructure and phase constituents of Nb-Ti-Si based alloys. Zr improves both the room-temperature toughness and the high-temperature strength. The alloy with addition of 8 at.% Zr shows the highest fracture toughness of 15.01 Mpa.m(1/2). The compressive strengths of the alloys are improved to 278.89-293.08 MPa for the Zr-containing alloys when compare with the Zr-free alloy (194.23 MPa). The oxidation resistance of the alloys was also obviously ameliorated with Zr addition, showing a reduced weight gain with the increase of Zr content.

引用

页码：19 / 27

页数：9

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