Rheological Behavior of AZ31 Magnesium Alloy Sheet Prepared by Equal Channel Angular Rolling

The plastic strain mechanism of AZ31 magnesium alloy sheet was investigated by room-temperature uniaxial tensile test.After equal channel angular rolling(ECAR),the plasticity of the rolled sheet along the rolling direction was obviously better than along the transverse direction.The elongation rate increased from 17.5% to 28.6%.The conventionally processed sheet showed a distinct(0002) basal plane orientation.However,the grain orientation of the sheet processed by equal channel angular rolling evolved from(0002) basal plane to non-basal plane.After being subjected to tensile failure,the conventionally rolled sheet had a lot of twin crystals,while the sheet processed by ECAR had much reduced twin crystals.A new sliding system may be started by ECAR,while the tension twinning acted as compatible deformation mechanism.