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采用液态浸渗挤压法制备了硼酸铝晶须增强铝基复合材料(简称(AlBO)w/Al),通过OM,XRD,EDS,SEM及TEM等研究手段对其微观缺陷进行观察分析。发现(AlBO)w/Al复合材料中的主要缺陷并非硼酸铝晶须与基体之间的界面反应产物,而是制备过程中晶须的偏聚重融、基体合金中析出的铜铝化合物Al2Cu及显微缩孔,它们作为复合材料的主要缺陷而成为裂纹源,最终影响复合材料的力学性能。
Aluminum borate whisker reinforced aluminum matrix composites (abbreviated as (AlBO) w / Al) were prepared by liquid infiltration squeeze method. Their microscopic defects were observed and analyzed by means of OM, XRD, EDS, SEM and TEM. It is found that the main defect in (AlBO) w / Al composites is not the interfacial reaction product between the aluminum borate whiskers and the matrix but the segregation and melting of the whiskers in the preparation process, the Al-Cu compound precipitated in the matrix alloy and Micro-shrinkage, which as a major defect in the composite material as a source of cracks, the final impact on the mechanical properties of composite materials.