Microstructure and properties of TiB2/Al-Si-Mg-Er composite

doi:10.13251/j.issn.0254-6051.2020.12.029

Abstract

Abstract: Al-7Si-0.5Mg-0.1Er and 0.5TiB₂/Al-7Si-0.5Mg-0.1Er alloys were prepared by remelting and dilution method, and the microstructure and properties of TiB₂ particle reinforced Al-Si-Mg-Er composites were studied. The results show that the as-cast microstructure of the composites is mainly composed of α-Al matrix, eutectic Si phase and TiB₂ particles. The addition of TiB₂ particles reduces the secondary dendrite spacing of the Al-7Si-0.5Mg-0.1Er alloy by 7.1 μm. The tensile strength reaches 217.53 MPa, which is 12.1% higher than that of the Al-7Si-0.5Mg-0.1Er alloy. The optimal T6 heat treatment process for the TiB₂/Al-Si-Mg-Er composite is 530 ℃×12 h solid solution +160 ℃×7 h aging. After this process, the tensile strength of the TiB₂ /Al-Si-Mg-Er composite reaches 319.49 MPa, which is 46.9% higher than that before heat treatment, and 5.9% higher than that of the Al-7Si-0.5Mg-0.1Er alloy. The yield strength reaches 266.75 MPa, which is increased by 106.4% compared with that before heat treatment and is 14.9% higher than that of the Al-7Si-0.5Mg-0.1Er alloy. The improvement of the tensile strength of the composite materials mainly comes from the grain refinement, modification and heat treatment strengthening of TiB₂ particles.

Key words: Al-Si-Mg-Er alloy, TiB₂ particles, composites, heat treatment, microstructure, mechanical properties

CLC Number:

TG142

Yang Zi’an, Xiang Zhilei, Chen Ziyong, Ren Weimin, Ma Xiaozhao. Microstructure and properties of TiB₂/Al-Si-Mg-Er composite[J]. Heat Treatment of Metals, 2020, 45(12): 142-148.

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Microstructure and properties of TiB₂/Al-Si-Mg-Er composite

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