变形参数对AZ31镁合金变形抗力的影响

Effect of deformation parameters on the deformation resistance of AZ31 alloy

利用Gleeble-1500热模拟试验机对AZ31镁合金在变形温度为250～400℃、变形速率为0.5～3.0s-1下进行热变形模拟实验,得到了AZ31镁合金真实应力-真实应变曲线,并通过光学显微镜观察了试样在变形中的微观组织.结果表明,动态再结晶是该实验条件下晶粒细化的主要机制,变形参数影响了再结晶的程度.

The hot compression behaviors of AZ31 magnesium alloy at 250 -- 400℃ and a strain rate of 0.5-3,0 s^-1 were investigated by means of isothermal compression test on a Gleeble-1500 thermal mechanical simulator. The true strain-true stress curves of AZ31 alloy under different deformation conditions were obtained, The microstructure after deformation was observed by optical microscopy. The results showed that dynamic recrystallization was a main mechanism responsible for grain refinement under the test conditions and was influenced by deformation parameters.