Al-Mg-Si铝合金热变形过程动态再结晶行为研究  

Investigation on Dynamic Recrystallization Behavior of Al-Mg-Si Aluminum Alloy during Hot Deformation

作　　者：刘建勃[1] 王智毅[1] 

机构地区：[1]榆林学院能源工程学院,陕西榆林719000

出　　处：《热加工工艺》2017年第9期67-70,74,共5页Hot Working Technology

摘　　要：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 compression experiment of AI-0.62Mg-0.73Si aluminum alloy was carded out by using Gleeble-1500D thermal simulator. The dynamic rectystallization behavior of the material was studied at deformation temperature of 673-793 K and strain rate of 0.001-1 s-1. The critical condition of the material under different thermal deformation parameters was determined by the critical condition dynamic model. Based on the modified Avrami equation, the dynamic recrystallization volume fraction model of Al-0.62Mg-0.73Si aluminum alloy was established. At the same time, the microstructure evolution of the material after thermal deformation was analyzed. The results show that the true stress of the material increases with the decrease of deformation temperature and decreases with the decrease of strain rate during hot deformation; the increase of deformation temperature and strain rate can promote the occurrence of dynamic reerystallization; the increase of temperature can effectively promote the softening of the material and increase the growth rate of the dynamic recrystallization grain.

关 键 词：铝合金 动态再结晶 体积分数模型 电子背散射衍射 

分 类 号：TG319[金属学及工艺—金属压力加工]