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采用Gleeble-1500D热模拟试验机对Al-0.62Mg-0.73Si铝合金进行了热压缩试验,研究了变形温度673~793K、变形速率0.001~1 s~(-1)下材料的动态再结晶行为。采用临界条件动力学模型确定了该材料在不同热变形参数下的临界条件,依据修正的Avrami方程建立了Al-0.62Mg-0.73Si铝合金动态再结晶体积分数模型,同时分析了材料热变形后的组织演变规律。结果表明:材料在热变形过程中,真应力随变形温度的降低而升高,随应变速率的下降而减小;变形温度与应变速率的升高均能促进动态再结晶行为的发生;温度的升高能够有效地促进材料的软化,并提高动态再结晶晶粒的长大速度。
The hot compressive tests of Al-0.62Mg-0.73Si aluminum alloy were carried out by Gleeble-1500D thermal simulator. The dynamic recrystallization behavior of Al-0.62Mg-0.73Si aluminum alloy was studied at deformation temperature of 673-793K and deformation rate of 0.001-1 s -1 . Based on the modified Avrami equation, the dynamic recrystallization volume fraction model of Al-0.62Mg-0.73Si aluminum alloy was established by using the critical-condition kinetic model and the critical conditions of the material under different thermal deformation parameters were determined. The evolution of the organization. The results show that the true stress of the material increases with the decrease of the deformation temperature and decreases with the decrease of the strain rate. The deformation temperature and the strain rate increase the dynamic recrystallization behavior. The temperature Elevated can effectively promote the softening of materials and increase the growth rate of dynamic recrystallization grains.