Microindentation is performed on hot isostatic pressed (HIP) Mg-Al (AM40) alloysamples produced by high-pressure die cast (HPDC) process for the purpose ofquantifying the mechanical properties of the α-Mg grains. The processof obtaining elastic modulus and hardness from indentation load-depth curves iswell established in the literature. A new inverse method is developed to extractplastic properties in this study. The method utilizes empirical yieldstrength-hardness relationship reported in the literature together with finiteelement modeling of the individual indentation. Due to the shallow depth of theindentation, indentation size effect (ISE) is taken into account whendetermining plastic properties. The stress versus strain behavior is determinedfor a series of indents. The resulting average values and standard deviationsare obtained for future use as input distributions for microstructure-basedproperty prediction of AM40.
