对用流变铸造方法制备的含石墨、SiC及SiO_2的铝基复合材料的金相组织、断口形态及磨损表面特征进行了观察和研究。复合料浆在凝固过程中,α固溶体,Si,CuAl_2及它们的共晶在外加粒子表面形核并长大。由于采用对复合料浆在浇注前迅速升温工艺,粒子短距离运动就可达到均匀分布。复合材料中外加粒子周围有一过渡层与基体连接,同时粒子表面又不同程度富集着活性元素Mg,因而粒子与基体之间结合良好,断裂及磨损后,粒子与基体之间无间隙,无裂纹。
An observation was carried out on the feature of microstructure, fracture and worn surface of the Al-base composite prepared by rheocasting with graphite, SiC and SiO_2. The a solid solution, Si, CuAl_2 and allied eutectics are found to nucleate and to grow up along the surface of particulates added during solidification of the compslurry. The short-range movement of the particulates may distribute more uniformly in matrix owing to rapidly raising temperature of the composlurry before casting. Over the particulate, a transition layer connects with the matrix, and the active element Mg accumulates more or less. Thus, the firm bond is joined between the particulate and matrix, and it makes no more pore and crack on the microstructure of fractured or worn surface.
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