AlMg_(4.5)MnZr合金热变形行为及热加工图研究  

Study on hot deformation behavior and hot processing map of AlMg_(4.5)MnZr alloy

作　　者：李亚彪 余伟[1,2] 梁家豪 程志诚 孟云 胡水平[1] LI Ya-biao;YU Wei;LIANG Jia-hao;CHENG Zhi-cheng;MENG YUN;HU Shui-ping(National Engineering Research Center for Advanced Rolling and intelligent Manufacturing,University of Science and Technology Beijing,Beijing 100083,China;National Engineering Research Center of Flat Rolling Equipment,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学高效轧制与智能制造国家工程研究中心,北京100083 [2]北京科技大学国家板带生产先进装备工程技术研究中心,北京100083

出　　处：《塑性工程学报》2024年第5期106-112,共7页Journal of Plasticity Engineering

基　　金：国家重点研发计划(2016YFB0301204)。

摘　　要：在Gleeble-3500热模拟试验机上进行了热模拟压缩试验,对AlMg_(4.5)MnZr合金在变形温度300~500℃、应变速率0.01~10 s^(-1)、变形量60%条件下进行了高温流变行为和组织演化分析,建立了AlMg_(4.5)MnZr合金的热变形本构方程和热加工图,并采用电子背散射衍射技术对热加工后AlMg_(4.5)MnZr合金的微观组织进行了验证分析。结果表明,该合金具有正的应变速率敏感性,在一定范围内,变形温度越高、应变速率越小,合金的动态再结晶特征越明显;运用建立的Arrhenius本构方程对该合金不同变形条件下的流变应力值进行了预测,预测值与实验测试值吻合较好;AlMg_(4.5)MnZr合金的热加工图中仅存在1个失稳区,可加工区间较大,其中最佳加工区域参数为:变形温度440~500℃,应变速率0.01~0.1 s^(-1)。The hot simulation compression tests were conducted on Gleeble-3500 thermo-mechanical simulator to analyze the high-temperature flow behavior and microstructural evolution of AlMg_(4.5)MnZr alloy at deformation temperatures of 300-500℃,strain rates of 0.01-10 s^(-1) and deformation of 60%.The constitutive equation and hot processing map for the thermal deformation of AlMg_(4.5)MnZr alloy were established,and electron backscatter diffraction(EBSD)technique was used to verify and analyze the microstructure of AlMg 4.5 MnZr alloy after hot processing.The results show that the alloy exhibits positive strain rate sensitivity.Within a certain range,the higher the deformation temperatures,the lower the strain rates,the more pronounced the dynamic recrystallization characteristics of the alloy.The established Arrhenius constitutive equation was used to predict the flow stress values of the alloy under different deformation conditions,and the predicted values matched well with the experimental test values.The hot processing map of the AlMg_(4.5)MnZr alloy shows only one unstable region,indicating wide range of processability.The optimal processing parameters are determined to be:deformation temperatures of 440-500℃and strain rates of 0.01-0.1 s^(-1).

关 键 词：流变应力 本构关系 热加工图 动态再结晶 

分 类 号：TG146.2[一般工业技术—材料科学与工程]