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Study of Surface Properties in Particulate-Reinforced Metal Matrix Composites (MMCs) Using Powder-Mixed Electrical Discharge Machining (EDM)

2013; Taylor & Francis; Volume: 29; Issue: 1 Linguagem: Inglês

10.1080/10426914.2013.852211

1532-2475

Sarabjeet Singh Sidhu, Ajay Batish, Sanjeev Kumar,

Additive Manufacturing and 3D Printing Technologies

Abstract This article investigates the surface modification of three different types of metal matrix composites (MMCs) 65vol%SiC/A356.2, 10vol%SiC-5vol%quartz/Al, and 30vol%SiC/A359 using powder-mixed electrical discharge machining (PMEDM) process. Microhardness and surface integrity were evaluated after each trial, and contributing process parameters were identified. It was found that microhardness increased primarily with increase in the density of reinforced particles in the matrix. Each workpiece was examined by X-ray diffraction (XRD) followed by scanning electron microscope (SEM) for surface integrity and material deposition. The results show the significant amount of metal transfer from the copper electrode as compared to graphite. Keywords: Metal matrix compositesMicrohardnessPowder mixed EDMSurface integrity