Effects of Ti3SiC2 Content on the Microstructure and Properties of Heat Treated (Ti5Si3+TiC)/TC4 Composites

被引：0
|
作者：
Wang Z. [1 ,2 ]
Gao Y. [1 ,2 ]
Huang X. [1 ,2 ]
Zhao S. [3 ]
机构：
[1] State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an
[2] Institute of Foundry Technology and Wear Resistant Materials, Xi'an Jiaotong University, Xi'an
[3] Guangxi Great Wall Machineries, Hezhou, 542699, Guangxi
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2020年 / 54卷 / 07期
关键词：
(Ti[!sub]5[!/sub]Si[!sub]3[!/sub]+TiC)/TC4 composite; Heat treatment; Mechanical property; Microstructure; Ti[!sub]3[!/sub]SiC[!sub]2[!/sub;
D O I：
10.7652/xjtuxb202007023
中图分类号：
学科分类号：
摘要：
To improve the aggregation of reinforcements in titanium matrix composites, solid solution and aging treatments were used, and the effects of Ti3SiC2 content on the microstructure and mechanical properties of the composites were studied. Scanning electron microscope and energy spectrum analyzer were adopted to observe the microstructures with different Ti3SiC2 contents. The refining mechanism of the matrix and the precipitation of the reinforcements during the heat treatment were investigated. The results show that the original grain size of as-treated composites decreases significantly with the Ti3SiC2 content, and the grain size of lamella α phase also reduces. Ti5Si3 particles precipitate in the α and β phases and at the interface of α and β phases, and its content increases with Ti3SiC2 content. The yield strength and compressive strength of the composites are significantly higher than that of TC4 alloy under the same heat treatment condition. When the mass fraction of Ti3SiC2 is 8%, the yield strength and compressive strength of (Ti5Si3+TiC)/TC4 composite reach 1 930 MPa and 2 500 MPa, respectively, and the best comprehensive mechanical properties are obtained. When the mass fraction of Ti3SiC2 increases continuously to 10%, the mechanical properties of the composites cannot be further improved through solid-solution strengthening and aging treatment. © 2020, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
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页码：196 / 204
页数：8
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