EBSD Study on the Superplastic Deformation of Mg-7.0Al-0.4Zn Magnesium Alloy

摘要:

采用EBSD分析技术研究了Mg-7.0Al-0.4Zn镁合金超塑性变形机制。结果表明，超塑拉伸变形主要是通过晶界滑动和晶内塑性滑移协调完成的。变形初期，随着变形量的增大，{0002}//ED的织构明显增强，晶内滑移起主要协调变形作用。变形中后期孪生开动，接近断裂时，晶内滑移基本消失，孪生成为主要的协调变形机制，但孪生的贡献较小

Abstract:

The superplastic deformation mechanism of Mg-7.0Al-0.4Zn alloy was studied by EBSD technology. Results indicate that with increasing of strain amount, the texture of {0002}//ED is strengthened obviously, and intragranular sliding plays a main role during the accommodated deformation. Twins have started at the medium and the final deformation stages; when approaching to failure, intragranular sliding vanishes, and twins replace it to play a main role. But the contribution of twins to deformation is relatively small