Mg₂Si粒子添加によるマグネシウム基複合材料の作製およびその機械的特性

抄録

Mg-Si alloys have high potential as heat resistant light metals because Mg₂Si dispersoids exhibit a high melting temperature, low density, low thermal expansion coefficient, and a reasonably high elastic modulus.
In this study, Mg₂Si compounds are formed in the solid-state by spark plasma sintering process, in employing the elemental powder mixture of Mg-33.33 mol% Si. The magnesium composite alloys including a large amount of Mg₂Si particles were fabricated. The relative density of the composite alloys decreases with increase in the amount of Mg₂Si particles because the dispersoids cause not only pores at primary particle boundaries, but poor sinterability between magnesium alloy powder due to their thermal stability. The elastic coefficient, however, increases in increasing the Mg₂Si content of the composite alloys.