研究AZ80镁合金进行降温多向挤压时变形温度对其组织与力学性能的影响,设置的初始变形温度为390℃与370℃.结果表明,相对较低的变形温度更有利于细化镁合金晶粒.坯料在370℃进行降温多向挤压得到的组织与力学性能更好,再结晶晶粒尺寸约3.5 μm,屈服强度201 MPa,断后延伸率6.78％.多向挤压工艺下,镁合金的动态再结晶机制有孪晶动态再结晶、连续动态再结晶和非连续动态再结晶.%Effects of deformation temperature on microstructure and mechanical properties of magnesium alloy AZ80 processed by hypothermal multiple extrusion were investigated.Initial deformation temperature includes 390 ℃ and 370 ℃.The results indicate that relatively lower deformation temperature is more beneficial for gain refinement of magnesium alloy.The specimen processed by hypothermal multiple extrusion at 370 ℃ has better microstructure and mechanical properties.The size of dynamically recrystallized grains is about 3.5 μm.The yield strength and elongation are 201 MPa and 6.78％ respectively.Mechanisms of dynamic recrystallization of magnesium alloy include twin dynamic recrystallization,continuous dynamic recrystallization,and discontinuous dynamic recrystallization.
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