AZ31 magnesium alloy sheets were prepared by multi-pass equal channel angular rolling(multi-pass ECAR).The microstructure,texture and tensile properties were investigated.The results have shown that the grains in the sheets are processed alternatively with refined and coarse multi-pass ECAR,which has a great effect on the grain size and the homogeneity in the sheets after annealing.The significant weakening of basal texture is due to the accumulative shear strain.After ECARed for 7 passes,the basal poles sp...