Abstract

In the current study, microstructure and interfacial analysis of Al–Si–Cu/Al₂O₃ composite were investigated. Alumina was added in different fractions to study their effect on the microstructure. The distribution of the particles inside the Al–Si–Cu matrix and the reactions at the interface were developed using optical, SEM, XRD and EDS. The microstructures of the composites revealed a uniform distribution of the Al₂O₃ particle. The analysis of the interface between the matrix alloy and the Al₂O₃ particles indicated the presence of wetting agent of MgAl₂O₄ at the interface between the particles and the matrix. Moreover there is no particle agglomeration. The addition of Al₂O₃ particles into Al–Si–Cu alloy led to a reduction in the time required to attain peak hardness during aging and enhancing the hardness. Also, the wear resistances of Al–Si–Cu alloy based composites were significantly improved with the addition of Al₂O₃ particles.

中文翻译：

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挤压铸造Al-Si-Cu / Al 2 O 3复合材料的组织，硬度和磨损特性

摘要

在当前的研究中，对Al-Si-Cu / Al ₂ O ₃复合材料的微观结构和界面分析进行了研究。以不同的比例添加氧化铝以研究其对微观结构的影响。使用光学，SEM，XRD和EDS可以确定Al-Si-Cu基体内颗粒的分布以及界面处的反应。复合材料的微观结构显示出Al ₂ O ₃颗粒的均匀分布。分析基体合金和Al ₂ O ₃颗粒之间的界面表明存在MgAl ₂ O ₄润湿剂在颗粒和基质之间的界面。而且，不存在颗粒团聚。在Al–Si–Cu合金中添加Al ₂ O ₃颗粒可以减少在时效过程中达到峰值硬度并提高硬度所需的时间。另外，通过添加Al ₂ O ₃颗粒，可以显着提高Al-Si-Cu合金基复合材料的耐磨性。