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用光学显微镜、X射线衍射仪以及电子万能试验机,研究了正挤压-扭转剪切变形对AZ31、AZ61和AZ80镁合金组织和力学性能的影响。结果表明,经正挤压-扭转剪切变形后,镁合金发生了显著的晶粒细化和基面织构弱化,其中:AZ61镁合金发生了充分的动态再结晶,可将晶粒尺寸显著细化至3μm,随挤压温度的升高,晶粒有所长大,基面织构受位错脱钉作用而进一步弱化,AZ31镁合金在挤压温度为250℃时获得优良的力学性能,其压缩率和抗压强度分别高达29.2%和395 MPa。
The effects of normal extrusion and torsional shear deformation on the microstructure and mechanical properties of AZ31, AZ61 and AZ80 magnesium alloy were studied by optical microscope, X-ray diffraction and electronic universal testing machine. The results show that after the normal extrusion-torsional shear deformation, the grain refinement of the magnesium alloy and the weakened texture of the base surface occur. Among them, the AZ61 magnesium alloy undergoes sufficient dynamic recrystallization and the grain size can be significantly The microstructure of the AZ31 magnesium alloy is further weakened to 3μm. With the increase of the extrusion temperature, the grains grow up and the texture of the base surface is further weakened by the dislocation and debonding. The AZ31 magnesium alloy has excellent mechanical properties when the extrusion temperature is 250 ℃ , Its compression rate and compressive strength are as high as 29.2% and 395 MPa respectively.