Processing maps and microstructural evolution of Al-Cu-Li alloy during hot deformation  

作　　者：Sheng-Li Yang Jian Shen Yong-An Zhang Zhi-Hui Li Xi-Wu Li Shu-Hui Huang Bai-Qing Xiong 

机构地区：[1]State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals

出　　处：《Rare Metals》2019年第12期1136-1143,共8页稀有金属（英文版）

基　　金：financially supported by the National Program on Key Basic Research Project of China (No.2012CB619504);the National Natural Science Foundation of China (No.51274046)

摘　　要：The hot deformation behavior of Al-Cu-Li alloy was investigated by hot compression tests in the temperature range of 340-500℃ with strain rate of 0.001-10.000 s^(-1).Based on the dynamic materials model(DMM),processing maps of the test alloy were developed for optimizing hot processing parameters.The optimum parameters of hot deformation for Al-Cu-Li alloy are at temperature of 400-430℃and strain rate of about 0.100 s^(-1),with efficiency of power dissipation of around 30%.The microstructural manifestation of the alloy deformed in instability domains is flow localization,and dynamic softening first occurs in flow localizations structure.In stable domains,dynamic recovery(DRV) and dynamic recrystallization(DRX) are the main microstructural evolution mechanism.DRX is gradually strengthened with the increase in deformation temperature and the decrease in strain rate.During hot deformation,the DRX mechanism of Al-Cu-Li alloy is dominated by continuous DRX(CDRX).A DRX model of Al-Cu-Li alloy is proposed based on the microstructural evolution process of the test alloy.The hot deformation behavior of Al-Cu-Li alloy was investigated by hot compression tests in the temperature range of 340-500℃ with strain rate of 0.001-10.000 s-1.Based on the dynamic materials model（DMM）,processing maps of the test alloy were developed for optimizing hot processing parameters.The optimum parameters of hot deformation for Al-Cu-Li alloy are at temperature of 400-430℃and strain rate of about 0.100 s-1,with efficiency of power dissipation of around 30%.The microstructural manifestation of the alloy deformed in instability domains is flow localization,and dynamic softening first occurs in flow localizations structure.In stable domains,dynamic recovery（DRV） and dynamic recrystallization（DRX） are the main microstructural evolution mechanism.DRX is gradually strengthened with the increase in deformation temperature and the decrease in strain rate.During hot deformation,the DRX mechanism of Al-Cu-Li alloy is dominated by continuous DRX（CDRX）.A DRX model of Al-Cu-Li alloy is proposed based on the microstructural evolution process of the test alloy.

关 键 词：Al-Cu-Li alloy Processing map Dynamic recovery and dynamic recrystallization Microstructural evolution 

分 类 号：TG146.21[一般工业技术—材料科学与工程]