Effects of Si on Microstructures and High Temperature Properties of Beta Stabilized TiAl Alloy

Canxu Zhou; F. P. Zeng; Bin Liu; Yong Liu; Kun Zhao; Jinzhong Lu; Congzhang Qiu; Jianbo Li; Yuehui He

doi:10.2320/matertrans.M2015355

Canxu Zhou, F. P. Zeng, Bin Liu, Yong Liu, Kun Zhao, Jinzhong Lu, Congzhang Qiu, Jianbo Li, Yuehui He

Author information

Canxu Zhou
State Key Laboratory of Powder Metallurgy, Central South University
F. P. Zeng
Fujian Longxi Bearing (Group) Corp., LTD
Bin Liu
State Key Laboratory of Powder Metallurgy, Central South University
Yong Liu
State Key Laboratory of Powder Metallurgy, Central South University
Kun Zhao
State Key Laboratory of Powder Metallurgy, Central South University
Jinzhong Lu
Fujian Longxi Bearing (Group) Corp., LTD
Congzhang Qiu
State Key Laboratory of Powder Metallurgy, Central South University
Jianbo Li
State Key Laboratory of Powder Metallurgy, Central South University
Yuehui He
State Key Laboratory of Powder Metallurgy, Central South University

Keywords: TiAl alloy, silicon addition, microstructure, high temperature compressive property, high temperature creep property

JOURNAL FREE ACCESS

2016 Volume 57 Issue 3 Pages 461-465

DOI https://doi.org/10.2320/matertrans.M2015355

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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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