Influence of Multi-directional Cold Rolling on Microstructure and Mechanical Anisotropy of AZ31 Magnesium Alloy Sheet
The influences of multi-directional cold rolling and unidirectional cold rolling on the microstructure and mechanical anisotropy of AZ31 magnesium alloy sheet were investigated by the observation of the microstructure and uniaxial tensile test at room temperature. The results show that, the multi-directional cold rolling can give rise to more twin and deformation bands compared with the unidirectional cold rolling. After the same annealing of 350℃×1 h, the multi-directional cold rolling alloy sheet presents better comprehension mechanical properties and lower mechanical anisotropy than that of the unidirectional cold rolling, as its grain size is smaller and the microstructure is much more uniform.