TiB2/Al-Si-Mg-Er复合材料的组织与性能

doi:10.13251/j.issn.0254-6051.2020.12.029

摘要/Abstract

摘要： 采用重熔稀释法制备了Al-7Si-0.5Mg-0.1Er和0.5TiB₂/Al-7Si-0.5Mg-0.1Er合金,研究了TiB₂颗粒增强Al-Si-Mg-Er复合材料的组织性能。结果表明,复合材料铸态组织主要由α-Al基体、共晶Si相和TiB₂颗粒组成。TiB₂粒子的加入使Al-7Si-0.5Mg-0.1Er合金二次枝晶间距减小了7.1 μm。抗拉强度达到217.53 MPa,较Al-7Si-0.5Mg-0.1Er合金提升了12.1 %。TiB₂/Al-Si-Mg-Er复合材料的最优T6热处理工艺为530 ℃×12 h固溶+160 ℃×7 h时效,经该工艺处理后,TiB₂/Al-Si-Mg-Er复合材料抗拉强度达到319.49 MPa,相比热处理前提高了46.9%,相比Al-7Si-0.5Mg-0.1Er合金提高了5.9%;屈服强度达到266.75 MPa,相比热处理前提高了106.4%,相比Al-7Si-0.5Mg-0.1Er合金提高了14.9%。复合材料抗拉强度的提升主要源于TiB₂颗粒加入后产生的晶粒细化、变质和热处理强化。

关键词: Al-Si-Mg-Er合金, TiB₂颗粒, 复合材料, 热处理, 组织, 力学性能

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

中图分类号:

TG142

杨子安, 相志磊, 陈子勇, 任伟敏, 马小昭. TiB₂/Al-Si-Mg-Er复合材料的组织与性能[J]. 金属热处理, 2020, 45(12): 142-148.

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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TiB₂/Al-Si-Mg-Er复合材料的组织与性能

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

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