High temperature deformation behaviors of a high Nb containing TiAl alloy

被引：111

作者：

Lin, J. P. ^{[1
]}

Xu, X. J. ^{[1
]}

Wang, Y. L. ^{[1
]}

He, S. F. ^{[1
]}

Zhang, Y. ^{[1
]}

Song, X. P. ^{[1
]}

Chen, G. L. ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

来源：

INTERMETALLICS | 2007年 / 15卷 / 5-6期

基金：

中国国家自然科学基金;

关键词：

titanium alummides; based on TiAl; microstructures; mechanical properties at high temperatures;

D O I：

10.1016/j.intermet.2006.10.029

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：

In the present paper, high temperature tensile and creep behaviors of Ti-45AI-9(Nb,W,B,Y) alloy with duplex (DP) microstructure were investigated. In addition to tensile tests at 815 degrees C and a strain rate range of 1 x 10(-4) s(-1)-1 x 10(-3) s(-1) and tensile, creep tests at 760 degrees C and 815 degrees C under the stress of 180 MPa, the microstructure evolutions during tensile and creep tests were studied. The results show that high temperature high Nb containing TiAl alloy with DP microstructure has a good balance between ductility and strength and intermediate creep resistance. The tensile properties have the strain rate dependence, and ultimate tensile strength (UTS) and yield strength (YS) vs. strain rate obey a single-logarithm linear relationship. Minimum creep rate is affected by the test temperature and stress. Using loading change experiment a stress exponent of 4.3 is determined. DP microstructure is unstable after long-term exposure at high temperatures, and the spheroidization of lamella and recrystallization along grain boundaries occur during the high temperature deformation. It is assumed that the diffusion-assisted climb of dislocations might be the controlling mechanism at the minimum creep rate stage. (C) 2006 Elsevier Ltd. All rights reserved.

引用

页码：668 / 674

页数：7

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