Effects of Grain Distribution on Mechanical Properties of AZ80 Magnesium Alloy at Room Temperature
Multiple types of AZ80 deformed magnesium alloy were prepared by high temperature ECAP.The micro-structure characteristics of magnesium alloy was analyzed by metallographic microscope(OM)and scanning electron microscope(SEM)to investigate the influence of grain distribution on mechanical properties of magnesium alloy at room temperature,and the strengthening mechanism of bimodal microstructure was explored.The results indicate that the yield strength,tensile strength and elongation of 17.5%of type A bimodal magnesium alloy are 226.1 MPa,454.3 MPa and 17.5%,respectively,with average grain size of 80 μm,which are higher than those with 4 μm(215.4 MPa,438.0 MPa,14.0%).The strengthening effect of type A bimodal structure is better than that of type B,and the strengthening effect of fine grains is between the two.The excessive grain refinement of type B bimodal structure can destroy the strengthening effect of bimodal structure.
NETL
NSTL
万方数据
