Effect of initial texture on the development of microstructure and mechanical properties in AZ31 magnesium alloy after rolling at 300°C

摘要

Mg alloys are drawing a lot of attention and have been extensively studied. The major obstacle to the practical application of the alloys is the poor formability at room temperature, originating basically from the insufficient number of slip system. Development of a proper microstructure and/or texture is one promising solution to improve the formability. In the present work, after extrusion and full annealing, rolling at 300°C with different starting textures, the microstructures, texture developments and tensile properties of AZ31 Mg alloys are studied. After full annealing strong <10-10>//ED fiber texture and weak <11-20> + <12-30>//ED fiber texture (c-axes in the radial direction) were developed. After rolling at 300°C many twins were formed, and the strong <10-10>//ED fiber texture changed to <0001>//ND texture. Yield strength, tensile strength and elongation changed obviously depending on the microstructure and textures.