颗粒增强的铝基复合材料已在航空航天、汽车等工业领域获得广泛的使用,但难加工性限制了此类复合材料的广泛应用.选用SiC颗粒和鳞片状石墨作为增强体,采用挤压铸造法制备SiCp+Gr/2024Al 复合材料,在保证材料力学性能的前提下改善材料的加工性能.结果表明,复合材料组织致密,石墨和SiC颗粒在基体中均匀分布;铸态组织中SiC和石墨颗粒与基体Al合金都未发现界面反应物;随着石墨的体积分数的增大,拉伸强度和弹性模量都下降,但加工性能得到明显的改善.石墨改善切削性能的机制为影响切屑形成机制和石墨对刀具的润滑作用.
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