Mechanical property of microstructure in die-cast magnesium alloy evaluated by indentation testing at elevated temperature

Abstract

Mg17Al12 is intermetallic compound in die-cast AZ91D alloy and will affect the macroscopic mechanical properties. Indentation tests on both eutectic β-Mg17Al12 phase and α-Mg matrix are carried out at room and elevated temperature. It is found that the yield stress and flow stress of Mg17Al12 phase are much larger than those of Mg matrix. Besides, the capabilities of plastic deformation of both phases are enhanced at elevated temperatures. The mechanical properties of both phases as a function of temperature are investigated. Based on the microstructural property, the temperature effect on macroscopic deformation behavior is also discussed.