WEAR BEHAVIOR OF AZ91D MAGNESIUM COMPOSITE

Year 2015, Volume: 33 Issue: 3, 465 - 471, 01.09.2015

Yaman Erarslan Cem Akça

Abstract

AZ91D alloy was produced using the conventional casting methods in a local foundry. Then, SiC ceramic additive materials (particulates) with 2%, 4% and 8% by weight (average grain size of 7 µm and 32 µm) were mixed with AZ91 alloy by stir-casting method. The properties of the AZ91 alloy and AZ91/SiC composite materials produced were determined by means of hardness and wear tests, and microstructural characterization was conducted by optical microscopy, scanning electron microscopy and x-ray diffraction. It was observed that the improvement in hardness for the composite with a diameter of 7 µm diameter is higher than the composite with a diameter of 32 µm. Wear testing was conducted through the ball-on-disc method at a rate of 10 cm.s-1 under a load of 5 N. The friction coefficient was found to be between the 0.115-0.172 intervals, and no wear was observed on the alumina (Al2O3) ball material.

Keywords

AZ91 alloy, metal matrix composite, wear

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