工业态AZ31B镁合金薄板的拉伸性能与组织变化

Microstructures and tensile properties of commercial AZ31B magnesium alloy sheets

对厚度为0.8mm的工业态AZ31B镁合金薄板在室温至400℃条件下进行了轴向拉伸实验,研究了变形过程中的组织与性能变化。结果表明,室温至100℃变形时,显微组织中出现少量孪晶;而200℃及以上变形时发生了动态再结晶。室温下AZ31B镁合金薄板具有较高的强度和较好的塑性;随着变形温度的升高,塑性增加,并呈现出低温超塑性或高应变速率超塑性特征。

Uniaxial loading tests are performed on 0.8 mm thick sheets of commercial AZ31B magnesium alloy in the temperature range from room temperature to 400 ℃. The microstructures and tensile properties are studied. The results reveal that there are few twins in the deformation microstructures created when deformation occurres in temperatures ranging from room temperature to 100 ℃, and dynamic recrystallization take place at deformation temperatures exceeding 200 ℃. Commercial AZ31B magnesium alloy sheets have a preferable strength and ductility at room temperature. The ductility of the sheets is improved as the deformation temperature increases. Some characteristics of low temperature superplasticity or high strain rate superplasticity exist.