A comprehensive evaluation of the abrasive wear mechanism of A356 / (0&5) wt.% SiCp Metal Matrix Composite in unidirectional and reciprocating contacts

Authors

• Biju P V Vidya Academy of Science & Technology, Thrissur https://orcid.org/0000-0002-8795-3415
• Manesh K. K Government Engineering College, Thrissur https://orcid.org/0000-0002-0788-5046
• V.R. Rajeev College of Engineering, Thiruvanathapuram

Keywords:

A356 Alloy, A356/5wt. % Si Cp composite, Unidirectional and reciprocating contacts, Abrasive wear maps, Wear mechanism, SEM & EDAX analysis

Abstract

The abrasive wear behaviour of A356 aluminium alloy and A356/5 wt.% SiCp composites were examined under unidirectional (USM) and reciprocating sliding modes (RSM) against 800 grit SiC abrasive medium. Wear maps developed at varying loads and velocities over a 25 metre sliding distance revealed that severe wear initiates at lower loads in RSM than USM, particularly in the base alloy. The composite exhibited enhanced wear resistance with a delayed onset of severe wear. Stereo microscopy and SEM analyses showed that RSM results in deeper, wider grooves and more surface degradation. Groove width in RSM was nearly three times greater than in USM, indicating increased wear severity. EDAX analysis revealed higher oxygen content in USM, suggesting the formation of an oxide layer which contributed to reduced friction. Overall, the findings highlight the critical role of sliding mode and SiCp (Silicon Carbide Particulates) reinforcement in influencing wear mechanisms and surface integrity in A356-based materials.