Effect of Si on microstructure and mechanical properties of (Ti<sub>5</sub>Si<sub>3</sub> + TiBw)/TC11

Zhong Liang; Fu Yu; Wang Yinyang; Han Jungang; Cao Zhaoxun; Song Yunkun; Li Lei; Xu Yongdong

doi:10.7513/j.issn.1004-7638.2022.01.007

Volume 43 Issue 1

Mar. 2022

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Zhong Liang, Fu Yu, Wang Yinyang, Han Jungang, Cao Zhaoxun, Song Yunkun, Li Lei, Xu Yongdong. Effect of Si on microstructure and mechanical properties of (Ti5Si3 + TiBw)/TC11[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 40-47. doi: 10.7513/j.issn.1004-7638.2022.01.007

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Zhong Liang, Fu Yu, Wang Yinyang, Han Jungang, Cao Zhaoxun, Song Yunkun, Li Lei, Xu Yongdong. Effect of Si on microstructure and mechanical properties of (Ti₅Si₃ + TiBw)/TC11[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 40-47. doi: 10.7513/j.issn.1004-7638.2022.01.007

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Effect of Si on microstructure and mechanical properties of (Ti₅Si₃ + TiBw)/TC11

doi: 10.7513/j.issn.1004-7638.2022.01.007

Ningbo Branch of Chinese Academy of Ordnance Science, Ningbo 315103, Zhejiang, China

Received Date: 2021-09-26
Available Online: 2022-04-24
Publish Date: 2022-02-28

Abstract

Abstract

The in-situ formed (Ti₅Si₃ + TiBw)/TC11 composites with network structure were prepared by powder metallurgy. The metallographic structure, microstructure, mechanical properties and fracture surface of (Ti₅Si₃ + TiBw)/TC11 were analyzed. The results show that TiBw and partial Ti₅Si₃ distribute around the matrix particles in a quasi continuous network. The rest of Ti₅Si₃ distributes around the matrix, in β-Ti and at the boundary between α-Ti and β-Ti. With the increase of Si content, the in-situ reinforcement of Ti₅Si₃ increases, and α-Ti changes from long flake shape to short rod shape and tends to be equiaxed, which can refine the microstructure obviously. TiBw and Ti₅Si₃ play the role of load transfer and phase boundary strengthening, which can reduce the matrix connectivity and refine the matrix microstructure simultaneously. It is found that the strength of the composites is improved accompanying partial decrease of plasticity of the matrix. The strength and plasticity of the composites first increase and then decrease with increase of Si content. The composite of (2vol.%Ti₅Si₃+5vol.%TiBw)/TC11 has the highest tensile strength and compressive strength respectively at 1 105.8 MPa and 1 870.6 MPa, showing excellent mechanical properties. The fracture morphology of (Ti₅Si₃+TiBw)/TC11 composites is mainly dimple, and the reinforcements of Ti₅Si₃ and TiBw can slow down the crack propagation during the fracture process.
- discontinuously reinforced titanium matrix composites,
- powder metallurgy,
- Si,
- microstructure,
- mechanical properties

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References(24)

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