MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Effects of Si on Microstructures and High Temperature Properties of Beta Stabilized TiAl Alloy
Canxu ZhouF. P. ZengBin LiuYong LiuKun ZhaoJinzhong LuCongzhang QiuJianbo LiYuehui He
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2016 Volume 57 Issue 3 Pages 461-465

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Abstract

The effects of Si addition on microstructures, high temperature compressive properties and creep properties of the β-stabilized Ti-45Al-3Fe-2Mo alloy have been studied in this work. The results show that the Si addition decreases the volume fraction of β phase and precipitates particulate Ti5Si3 phase. At the same time, the Si addition improves the high temperature strength of the Ti-45Al-3Fe-2Mo alloy for about 200 MPa at 800°C and decreases the creep strain for about 35% at 800°C under an applied stress of 150 MPa. The decrease in volume fraction of β phase and precipitation of Ti5Si3 particles are believed to be the dominant mechanisms for the improvement of the high temperature properties of the Si-doped TiAl alloy.

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© 2016 The Japan Institute of Metals and Materials
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