Authors: Xuezhi Zhang Li Fang Bojun Xiong Henry Hu
Publish Date: 2015/10/30
Volume: 24, Issue: 12, Pages: 4601-4611
Abstract
Magnesium alloy AM60 matrixbased composite reinforced with 7 9 11 22 and 35 vol of Al2O3 fibers was squeeze cast The microstructure and mechanical properties were investigated in comparison with the matrix alloy AM60 The results of tensile testing indicated that the addition of Al2O3 fibers to magnesium alloy AM60 led to a significant improvement in mechanical properties As the fiber volume fraction increased the strengths and moduli of the composites were enhanced considerably However the notable increase in strengths was at sacrifice in elongation Microstructural analyses via scanning electron microscopy SEM revealed that the grain size decreased with increasing volume fractions of reinforcement The restriction of grain growth by the limited interfiber spacing could be the primary mechanism for a reduction in the grain size of the matrix alloy The SEM fractography evidently reveals that the debonding of fibers from the matrix alloy and the fiber cracking were two primary mechanisms for the tensile failure of the composites
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