Creep behavior of as-cast Ti-48Al-2Cr intermetallic alloy for aerospace and automotive applications

被引：6

作者：

Hamzah, E. ^{[1
]}

Kanniah, M.

Harun, M.

机构：

[1] Univ Teknol Malaysia, Fac Mech Engn, Dept Mat Engn, Johor Baharu 81310, Malaysia

[2] Malaysian Inst Nucl Technol Res, Ind Technol Div, Bangi, Malaysia

来源：

MATERIALS AND MANUFACTURING PROCESSES | 2007年 / 22卷 / 7-8期

关键词：

activation energy; alloy; as-cast; chromium; creep; initial stress; instantaneous creep strain; microstructure; minimum creep behavior; steady state creep behavior; stress exponent; temperature; Ti-48Al; Ti-48Al-2Cr; TiAl;

D O I：

10.1080/10426910701446663

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The creep properties of as-cast Ti-48Al-2Cr (at%) alloy which had been strengthen with addition of 2 at% Cr were investigated. Tensile creep experiments were performed in air at temperatures from 600-800 degrees C and initial stresses ranging from 150 to 180 MPa. Stress exponent and activation energy were both measured. Data indicates that the alloy exhibits steady state creep behavior and the steady state creep rate is found to depend on the applied load and temperature. The measured power law stress exponent for steady state creep rate is found to be close to 3 and the apparent activation energy for creep is calculated to be 15.7kJ/mol. The creep resistance of the present alloy was also compared with binary Ti-48Al (at%) to evaluate the effect of Cr addition on creep resistance of TiAl. It is concluded that addition of 2 at% of Cr does not have significant effect on the creep resistance of TiAl.

引用

页码：793 / 797

页数：5

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