Investigation on the Removal Mechanism of Fixed Abrasive Polishing SiCp/Al Composites

SiC particle reinforced Al metal matrix composites (SiCp/Al) are typical difficult-to-machine materials due to the heterogeneous constituent. To explore material removal mechanisms in Fixed Abrasive Polishing (FAP), this study carries out low-speed polishing on an SiCp/Al at a rotational velocity from 15 rpm to 35 rpm, and assesses surface integrity including surface damage and material removal form to explore how different polishing speeds take effect therein. The results indicate that high-speed polishing may result in better surface quality. The polished sic surface changes from a concave cavity to a fish scale shape, and the removal form of sic particles changes from whole extraction and brittle fracture to ductile removal. A removal model for SiCp/Al in consolidated abrasive polishing was established, and the material removal mechanism was revealed. Simulate the removal of sic particles at different depths using Molecular Dynamics (MD) simulation. Our researches benefit to understand the mechanical removal mechanism of SiCp/Al substrates and give theoretical guide for improving the machining technology of FAP.