Abstract: Effects of accumulative roll bonding temperature on grain size, basal texture, interfacial bonding and mechanical properties of the AZ31 magnesium alloy were investigated by using optical microscopy, tensile test at room temperature, microhardness tester, X-ray diffractometer and scanning electron microscope. The results show that the grain refining effect of AZ31 magnesium alloy after accumulative roll bonding three-pass is obvious, and the hardness increases. As the accumulative roll bonding temperature increases, the grain refining effect and the increase trend of hardness weakens. The increase of accumulative roll bonding temperature can weaken the basal texture. The comprehensive mechanical properties are capable of reaching the best when the AZ31 magnesium alloy sheets accumulative roll bonded three-pass at 450 ℃, i.e. the microhardness of 70.64 HV0.05, tensile strength of 288.64 MPa, yield strength of 203.76 MPa, elongation of 16.96% and interfacial bonding strength of 21.53 MPa.

Key words: accumulative roll bonding, basal texture, mechanical properties, grain size