Microstructure and properties of Ti/(TiB+TiC) composites prepared by low-cost TiH<sub>2</sub> powders

LIN Dongjian; LIU Zhongqiang; TANG Hao; ZHANG Jiantao; XIAO Zhiyu

doi:10.19591/j.cnki.cn11-1974/tf.2022010002

Volume 42 Issue 2

Apr. 2024

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Article Navigation > Powder Metallurgy Technology > 2024 > 42(2): 135-143

LIN Dongjian, LIU Zhongqiang, TANG Hao, ZHANG Jiantao, XIAO Zhiyu. Microstructure and properties of Ti/(TiB+TiC) composites prepared by low-cost TiH2 powders[J]. Powder Metallurgy Technology, 2024, 42(2): 135-143. doi: 10.19591/j.cnki.cn11-1974/tf.2022010002

Citation:

LIN Dongjian, LIU Zhongqiang, TANG Hao, ZHANG Jiantao, XIAO Zhiyu. Microstructure and properties of Ti/(TiB+TiC) composites prepared by low-cost TiH₂ powders[J]. Powder Metallurgy Technology, 2024, 42(2): 135-143. doi: 10.19591/j.cnki.cn11-1974/tf.2022010002

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Microstructure and properties of Ti/(TiB+TiC) composites prepared by low-cost TiH₂ powders

doi: 10.19591/j.cnki.cn11-1974/tf.2022010002

National Engineering Research of Net-Sharp Forming for Metallic Material, South China University of Technology, Guangzhou 510640, China

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Corresponding author: E-mail: zhyxiao@scut.edu.cn
Received Date: 2022-01-15
Publish Date: 2024-04-28

Abstract

Abstract

Ti/(TiB+TiC) titanium matrix composites with the excellent mechanical properties were prepared by vacuum pressureless sintering and hot extrusion by using low-cost TiH₂ powders instead of pure titanium powders and adding B₄C to in-situ produce TiB and TiC reinforcements. The effects of preparation technology and reinforcements on the microstructure and properties of the Ti/(TiB+TiC) composites were analyzed. The results show that the TiH₂ powders have the good sintering activity, and the relative density of the sample after dehydrogenation and sintering can reach 97.7%, which is further increased to 99.9% after the hot extrusion as closed to full density. The TiB reinforcements are short fibrous, and the TiC reinforcements are granular, which are uniformly distributed in the equiaxed α-Ti matrix, restraining the growth of equiaxed grains and refining the grains. The hot extrusion process can further refine the grains and make the microstructure more uniform and compact, the as-extruded titanium matrix composites show the high hardness and good matching of strength and ductility. The TiH₂+4%B₄C (volume fraction) extruded composites have the Vickers hardness of Hv_0.3 310, yield strength of 683 MPa, tensile strength of 851 MPa, and elongation of 15.1% after fracture.
- TiH₂ powders,
- titanium matrix composites,
- hot extrusion,
- microstructure,
- mechanical properties

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References(29)

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