抄録
Die-cast magnesium alloy (AZ91D) contains intermetallic compound of Mg_<17>Al_<12>, which may affect the macroscopic mechanical properties. Here, we investigated the mechanical properties of Mg_<17>Al_<12> phase by using micro indentation testing. In this method, uni-axial stress and strain curve can be derived based on reverse analysis. Micro indentation tests were carried out for both β-Mg_<17>Al_<12> phase and a-Mg matrix at room temperature. It is found that the yield stress and flow stress of Mg_<17>Al_<12> phase were much larger than Mg matrix. In particular, the yield stress achieves more than 300 MPa, which is twice larger than Mg matrix. Thus, the intermetallic compound of Mg_<17>Al_<12> may affect macroscopic properties of AZ91D alloy.
