Effect of Mg on microstructure and mechanical properties of in-situ TiB<sub>2</sub>/Al-4.5Cu composites

XUE Yanqing; HAO Qitang; LI Xinlei; WEI Dian; LI Bo; YU Liangliang

doi:10.13801/j.cnki.fhclxb.20200814.003

Volume 38 Issue 5

May 2021

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XUE Yanqing, HAO Qitang, LI Xinlei, et al. Effect of Mg on microstructure and mechanical properties of in-situ TiB2/Al-4.5Cu composites[J]. Acta Materiae Compositae Sinica, 2021, 38(5): 1507-1516. doi: 10.13801/j.cnki.fhclxb.20200814.003

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XUE Yanqing, HAO Qitang, LI Xinlei, et al. Effect of Mg on microstructure and mechanical properties of in-situ TiB₂/Al-4.5Cu composites[J]. Acta Materiae Compositae Sinica, 2021, 38(5): 1507-1516. doi: 10.13801/j.cnki.fhclxb.20200814.003

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Effect of Mg on microstructure and mechanical properties of in-situ TiB₂/Al-4.5Cu composites

doi: 10.13801/j.cnki.fhclxb.20200814.003

School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710012, China

Received Date: 2020-07-06
Accepted Date: 2020-08-06

Available Online: 2020-08-17

Publish Date: 2021-05-01

Abstract

Abstract

The 3wt% TiB₂/Al-4.5Cu composites with different mass fraction of Mg were fabricated by Al-K₂TiF₆-KBF₄ molten salt reaction method. The influences of Mg and multistage heat treatment on the microstructure and mechanical properties of the 3wt% TiB₂/Al-4.5Cu composite were studied by means of SEM, TEM, HM hardness test and room temperature tensile test. The microstructure observation shows that the agglomeration of TiB₂ particles is obviously improved after multistage heat treatment along with addition of Mg, In particular, with 3wt% Mg, the average size of TiB₂ particles is about 130 nm, accompanied by a large number of dispersed nano particles, and the grain size of α-Al is also significantly reduced. The mechanical test results show that after multistage heat treatment, the hardness and tensile strength of the 3wt% TiB₂/Al-4.5Cu composite are enhanced with the increase of Mg content. However, excess Mg content (mass fraction≥4wt%) will decrease the refinement effect of TiB₂ particles. The analysis reveals that addition of Mg can reduce the interfacial energy of TiB₂/α-Al and block the formation of brittle phase Al₃Ti, Al₂B. Meanwhile, the MgAl₂O₄ formed by reaction makes the interface become into the TiB₂/MgAl₂O₄/α-Al, which could restrain the agglomeration of TiB₂ particles and improve the wettability of the interface between TiB₂ particles and Al liquid, increase the nucleation rate and refine the grain size.
- TiB₂/Al-4.5Cu composites,
- Mg,
- microstructure,
- hardness,
- mechanical properties
Long Abstrsct
Innovation Points

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References(30)

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