任东,董俊,赵恒峰,等.汽车用Mg2Si增强A356铝基复合材料的变质处理与组织性能研究[J].精密成形工程,2025,17(3):141-147.
REN Dong,DONG Jun,ZHAO Hengfeng,et al.Modification and Microstructure and Properties of Mg2Si Reinforced A356 Aluminum Matrix Composite Materials for Automotive[J].Journal of Netshape Forming Engineering,2025,17(3):141-147. |
| 汽车用Mg2Si增强A356铝基复合材料的变质处理与组织性能研究 |
| Modification and Microstructure and Properties of Mg2Si Reinforced A356 Aluminum Matrix Composite Materials for Automotive |
| 投稿时间：2024-05-17 |
| DOI：10.3969/j.issn.1674-6457.2025.03.016 |
| 中文关键词: 振动频率 Mn/Cr变质处理 13%Mg2Si/A356-1.3Fe复合材料 显微组织 拉伸性能 |
| 英文关键词: vibration frequency Mn/Cr ratio modification 13%Mg2Si/A356-1.3Fe composite material microstructure tensile property |
| 基金项目:四川省教育厅自然科学研究项目(22ZB00712);四川省创新能力提升工程-青年基金专项(CXNL-2021138) |
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| 中文摘要: |
| 目的 提升汽车轮毂用13%(质量分数，下同)Mg2Si/A356-1.3Fe复合材料的力学性能。方法 采用振动铸造的方法制备13%Mg2Si/A356-1.3Fe复合材料，研究了振动频率(0~180 Hz)和不同Mn/Cr质量比(0%∶1%~1%∶0%)变质处理对复合材料显微组织、物相组成、室温拉伸性能和高温拉伸性能的影响，并对比分析了热处理态复合材料和A356再生铝合金(对比材料)的显微组织和拉伸性能。结果 施加不同振动频率后，复合材料中初生相的尺寸细小、分布均匀，在复合材料浇铸过程中施加机械振动有助于提高材料的抗拉强度，当振动频率为180 Hz时，复合材料的抗拉强度约为未施加机械振动时的1.51倍。不同Mn/Cr比变质处理后，复合材料中富铁相的形态、尺寸和类型都发生了改变，除Mn/Cr比为1%∶0%外，经其他Mn/Cr比变质处理的复合材料的抗拉强度都高于未变质处理的复合材料的抗拉强度，且Mn/Cr比为0.5%∶0.5%变质处理复合材料的抗拉强度最大，约为未变质处理复合材料的1.2倍。结论 经过机械振动、Mn/Cr比为0.5%∶0.5%变质处理和热处理后，复合材料中富铁相为α-Fe(Al8Fe2Si)相，相较于再生铝合金，其室温、150 ℃和350 ℃时的抗拉强度分别提高了26.0%、53.9%和124.5%。 |
| 英文摘要: |
| The work aims to improve the mechanical properties of 13% (in mass, the same below) Mg2Si/A356-1.3Fe composite materials for automotive hubs. The 13%Mg2Si/A356-1.3Fe composite materials were prepared by vibration casting method. The effects of vibration frequency (0-180 Hz) and modification with different Mn/Cr mass ratios (0%∶1%-1%∶0%) on the microstructure, phase composition and tensile properties of the composite materials were studied and the microstructures and tensile properties of the heat-treated composite materials and A356 recycled aluminum alloy (control material) were compared and analyzed. The size and distribution of primary phases in composite materials became smaller and more uniform after different vibration frequencies were applied and applying mechanical vibration during the pouring process of composite materials improved the tensile properties of the composite materials. The tensile strength of composite materials at vibration frequency was 180 Hz, about 1.51 times higher than that under no mechanical vibration. After modification with different Mn/Cr ratios, the morphology, size, and type of iron rich phases in the composite materials changed. Except for those under Mn/Cr=1%∶0%, the tensile strength of other Mn/Cr ratio modified composite materials was higher than that of unmodified composite materials. Moreover, when Mn∶Cr was 0.5%∶0.5%, the modified composite materials had the highest tensile strength, about 1.2 times that of unmodified composite materials. After mechanical vibration, Mn∶Cr=0.5%∶0.5% modification, and solid solution+aging heat treatment, the composite material is mainly composed of α-Al, Mg2Si, eutectic Si, and α-Fe (Al8Fe2Si) phase, and the tensile strength at room temperature, 200 ℃, and 300 ℃ is 26.0%, 53.9%, and 124.5% higher than that of recycled aluminum alloy, respectively. |
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