采用喷射沉积技术制备了SiC颗粒增强铝硅合金复合材料,研究了SiC颗粒粒径对复合材料显微组织及其拉伸性能的影响.结果表明:SiC颗粒的加入使复合材料的弹性模量高于基体合金的,但是其抗拉强度以及伸长率降低；挤压后复合材料中SiC颗粒分布有沿挤压方向排列的趋势,且随颗粒粒径的增大,趋势更明显；与相同含量大粒径(20 μm)颗粒相比,小粒径(4.5μm)颗粒间距小,颗粒承载能力大,其复合材料表现出较高的弹性模量和抗拉强度,断裂方式以SiC颗粒与基体界面脱离为主,而颗粒的断裂是大粒径SiC颗粒增强复合材料的主要断裂方式.
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