Low-temperature superplasticity at high strain rates in ultra fine-grained magnesium alloys

研究了镁合金在高应变速率下实现低温超塑性的细晶加工工艺。采用搅拌摩擦法制备合金。提出了一些不利于晶界滑动发生的合金元素。此外，我们还揭示了高应变速率下的高温变形行为，这与搅拌摩擦加工的应变速率相对应。在此基础上，提出了一些搅拌摩擦处理技术，以增加细晶粒面积。

The fine-grain processing of magnesium alloys was investigated for attaining low-temperature superplasticity at high strain rates. The alloys were produced by friction stir processing. Some alloying elements were suggested to be detrimental for grain boundary sliding to occur. In addition, we revealed the high temperature deformation behavior at high strain rates, which corresponds to the strain rates for friction stir processing. Based on these results, we proposed some techniques for friction stir processing, which will enable to increase the area with fine grains.