Microstructure and high temperature tensile properties of (TiC+TiB) reinforced titanium matrix composites by vacuum induction suspension melting

Wang Zhenling; Yu Yucheng; Li Ruizhi; Li Qiang; Han Jiaping; Ma Lan

doi:10.7513/j.issn.1004-7638.2021.05.009

Volume 42 Issue 5

Oct. 2021

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Wang Zhenling, Yu Yucheng, Li Ruizhi, Li Qiang, Han Jiaping, Ma Lan. Microstructure and high temperature tensile properties of (TiC+TiB) reinforced titanium matrix composites by vacuum induction suspension melting[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 54-61. doi: 10.7513/j.issn.1004-7638.2021.05.009

Citation:

Wang Zhenling, Yu Yucheng, Li Ruizhi, Li Qiang, Han Jiaping, Ma Lan. Microstructure and high temperature tensile properties of (TiC+TiB) reinforced titanium matrix composites by vacuum induction suspension melting[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 54-61. doi: 10.7513/j.issn.1004-7638.2021.05.009

Citation:

Wang Zhenling, Yu Yucheng, Li Ruizhi, Li Qiang, Han Jiaping, Ma Lan. Microstructure and high temperature tensile properties of (TiC+TiB) reinforced titanium matrix composites by vacuum induction suspension melting[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 54-61. doi: 10.7513/j.issn.1004-7638.2021.05.009

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Microstructure and high temperature tensile properties of (TiC+TiB) reinforced titanium matrix composites by vacuum induction suspension melting

doi: 10.7513/j.issn.1004-7638.2021.05.009

College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China

Received Date: 2021-08-24
Publish Date: 2021-10-30

Abstract

Abstract

(TiC+TiB)/Ti-6Al-4Sn-8Zr-0.8Mo-1.5Nb-1W-0.25Si titanium matrix composites were prepared by vacuum induction suspension melting, with the reinforcement composition volume ratio respectively at 0%, 2% and 4%. The microstructure and high temperature tensile properties of the composites were investigated by metallographic microscope, SEM, XRD, TEM and high temperature tensile testing machine. The results show that the titanium alloy is mainly composed of α-Ti phase and Ti₂ZrAl phase, and the Ti₂ZrAl phase is distributed at the junction of α-Ti flakes. In addition, there also exist polygonal bulk TiC and long TiB whiskers. The microstructure of the titanium alloy is typical widmandgren structure, and the α-Ti phase presents long needlelike shape with nearly parallel arrangement in the β-Ti grains. In titanium matrix composites, with the increase of reinforcement composition, the length to diameter ratio of α-Ti significantly decreases, and the grain size of β-Ti is refined. The strength of titanium matrix composites is increased significantly at 650～700 ℃. The best strengthening effect appears at 650 ℃ for the composites with 2% reinforcement composition while at 700 ℃ for the composites with 4% reinforcement composition. When the temperature exceeds 700 ℃, the strengthening effect of the reinforcement composition is weakened. The plasticity of the composites is generally low. The strengthening mechanism of the titanium matrix composites are attributed to the grain refinement, solid solution strengthening and load transfer strengthening. The fracture mode of the titanium matrix composites is brittle fracture under high temperature tensile conditions.
- titanium matrix composites,
- (TiC+TiB),
- vacuum induction suspension melting,
- microstructure,
- high temperature tensile property

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References(16)

References

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