AZ31镁合金板材双向循环弯曲的孪晶组织及织构

Twins and Texture of AZ31 Magnesium Alloy Sheet Deformed by Bidirectional Cyclic Bending

摘要:

摘要：采用等温双向循环弯曲工艺(BCBT)改善了AZ31镁合金板材的微观组织、织构和力学性能。在变形温度为483K时,经过多个道次等温双向循环弯曲变形后，AZ31镁合金板材再结晶组织主要发生在孪晶晶界、孪晶界与晶界交叉处、孪晶与孪晶的交叉处，并且再结晶晶粒尺寸小于孪晶带宽度。当变形温度为523K时，再结晶组织主要在晶界处形核并长大。在变形温度为483K时，经过3个道次等温双向循环弯曲变形后，AZ31镁合金板材的基面织构得到明显弱化，织构强度由原始9.8降低到变形后3.5，平均晶粒尺寸为12.2μm，在室温条件下的延伸率达到17.1%。

Abstract:

Abstract: Bidirectional cyclic bending technology(BCBT) had been used to improve the microstructure and texture and mechanical properties of AZ31 magnesium alloy sheet. When AZ31 Magnesium alloy sheet deformec by BCBT, the recrystallization had occurred in twins boundary, and across area between twins boundary and crystal boundary, and across area between twins and twins. And grain size was less than twins width. When deformation temperature of BCBT was 523K, the recrystallization nucleation had occurred in crystal boundary and grown up quickly. When deformation temperature was 483K and deformation process was 3 times, basal texture of AZ31 magnesium alloy sheet was weakened, and texture intensity was reduced from 9.59 to 3.54, and average grain size was 12.2μm，and elongation ratio was 17.1% at room temperature. .