Microstructural and hardness study of stir-casted AZ91D/B₄C MMCs
by Sakshi Singh; Nathi Ram Chauhan
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 13, No. 6, 2018

Abstract: This paper investigates the effect of the amalgamation of reinforced based metal matrix composites by using vacuum-based stir casting process. AZ91D Mg alloy is the matrix material and B₄C with varying volume ratio fractions (2, 4, and 6%) act as reinforcement. For microstructural observation, specimens have been machined, polished and then etched. Vickers macro hardness has been evaluated under room temperature. The improvement in macro-hardness has been found in reinforced B₄C/AZ91D MMCs as compared to cast-AZ91D Mg alloy. The microstructural study reveals the enhancement in homogeneity of AZ91D MMCs due to the addition of B₄C reinforcement. The heterogeneous formation of α-Mg matrix and Mg₁₇Al₁₂ has been found to be dominant in the form of dendrite-like three-dimensional branches. The reduction in porosity and voids (microstructural defects) have been observed in B₄C/AZ91D MMCs by vacuum-based stir casting as compared with cast-AZ91D Mg alloy.

Online publication date: Sat, 09-Feb-2019

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