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采用多层喷射共沉积工艺制备了SiCp/Al复合材料锭坯。以不同挤压比对其进行热挤压变形,研究了挤压变形对SiC增强颗粒分布特征的影响。结果表明:喷射沉积制坯过程中,SiC颗粒主要粘附于合金液滴的表面,造成SiC颗粒在合金液滴表面较多,内部较少,使SiC颗粒呈现层状分布特征。在挤压变形的三向应力作用下,这种层状分布特征难以消除。SiC颗粒在挤压棒材中呈条带状流线分布,横截面上则呈“年轮”分布特征。增大挤压比,挤压棒材中SiC颗粒的分布趋于均匀。
SiCp / Al composite billets were prepared by multilayer spray co-deposition process. The hot extrusion deformation was carried out with different extrusion ratios. The effect of extrusion deformation on the distribution characteristics of SiC reinforced particles was studied. The results show that the SiC particles mainly adhere to the surface of the alloy droplet in the process of spray deposition, resulting in more SiC particles on the surface of alloy droplets and less in the interior, which makes the SiC particles appear layered distribution. In the extrusion deformation of the three-way stress, this layered distribution features difficult to eliminate. The SiC particles flowed in the shape of stripes in the extruded bar and the “ring” distribution in the cross section. Increase the extrusion ratio, squeeze the distribution of SiC particles tend to be uniform.