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| Microstructure and properties of high-throughput in situ network structure TiC reinforced TC4 composite materials |
| DU Kanghong, LIU Zhongqiang, ZHANG Jiantao, WEN Liping, XIAO Zhiyu |
| National Engineering Research of Net-Shape Forming for Metallic Material, South China University of Technology, Guangzhou 510640, China |
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Abstract Using TC4 alloy powders with different particle sizes as the matrix material, using VC as the carbon source, using high throughput hot press sintering process, TiC/TC4 composites were prepared with different network structure sizes and TiC volume fractions (2%, 4%, 6%). The effect of TiC content and TC4 powder particle sizes on the microstructure and properties of composite materials were studied. The results show that the TiC reinforcement particles in TiC/TC4 titanium matrix composites are distributed in a network. Compared with TC4 alloy, the microstructure of TiC/TC4 composite materials are significantly refined. As the TiC content increases, the thickness of the TiC network layer increases, and the tensile strength and elongation of the material first increase and then decrease. The material with 2%TiC has the best overall performance. As the particle size of TC4 decreases, the microstructure of the TiC/TC4 composite is gradually refined, the connectivity of the matrix increases, and the tensile strength and elongation of the material increase at the same time. 2%TiC/TC4 composite material prepared by TC4 alloy powders with a particle size of 40-80 μm has a small network structure and the best overall performance. The yield strength, tensile strength and elongation reach 946 MPa, 1058 MPa and 18.1%, respectively, which are 29.6%, 31.6%, and 118.1% higher than TC4 alloy.
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Received: 17 August 2021
Published: 28 February 2022
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2022, Vol. 27 
