论文部分内容阅读
采用等温双向循环弯曲工艺(bidirectional cyclic bending technology,BCBT)改善了AZ31镁合金板材的微观组织、织构和力学性能。循环弯曲变形能够产生压缩变形与拉伸变形的交替变化,使镁合金材料发生压缩变形→孪晶组织形成→发生动态再结晶→孪晶消失→晶粒细化的组织演变过程,形成分布均匀的细小的晶粒组织,改善了镁合金材料性能。AZ31镁合金板材在变形温度为483 K时经过3个道次的等温双向循环弯曲变形后,基面织构得到明显弱化,织构强度由原始9.59降低到变形后3.54,平均晶粒尺寸为12.2μm。在变形温度443 K,经过1个道次变形后,AZ31镁合金板材的抗拉强度为325 MPa,屈服强度为225 MPa。与原始坯料力能参数相比,抗拉强度提高了19%,屈服强度提高了28%。当变形温度483 K循环变形3道次时,材料的伸长率为17.1%,比原始材料提高了42%。
The microstructure, texture and mechanical properties of AZ31 magnesium alloy sheet were improved by using the bidirectional cyclic bending technology (BCBT). Cyclic bending deformation can produce alternating deformation of compression deformation and tensile deformation of the magnesium alloy material occurs compressive deformation → twins → → dynamic recrystallization → twins disappear → grain refinement of the organizational evolution to form a uniform distribution Fine grain structure, improve the performance of magnesium alloy materials. After three passes of isothermal biaxial bending deformation of AZ31 magnesium alloy sheet at a deformation temperature of 483 K, the texture of the base surface was significantly weakened, the texture strength decreased from original 9.59 to 3.54 after deformation, and the average grain size was 12.2 μm. The deformation temperature of 443 K, after a pass deformation, AZ31 magnesium alloy sheet tensile strength of 325 MPa, yield strength of 225 MPa. Tensile strength increased by 19% and yield strength by 28% compared to that of the original billet. When the deformation temperature is 483 K, three times of cyclic deformation, the elongation of the material is 17.1%, which is 42% higher than the original material.