热变形温度对2124铝合金微观组织的影响  

Effect of hot deformation temperature on the microstructure of 2124 aluminium alloy

作　　者：赵沛浩 张思平 田宇兴 董浩 刘成 ZHAO Peihao;ZHANG Siping;TIAN Yuxing;DONG Hao;LIU Cheng(Chinalco Materials Application Research Institute Co.,Ltd.,Beijing 102209;Southwest Aluminium(Group)Co.,Ltd.,Chongqing 401326,China)

机构地区：[1]中铝材料应用研究院有限公司,北京102209 [2]西南铝业(集团)有限责任公司,重庆401326

出　　处：《铝加工》2025年第2期39-44,共6页Aluminium Fabrication

摘　　要：利用热压缩试验研究了应变速率为1 s^(-1)、热变形温度为360~500℃时的2124铝合金微观组织特征。利用光学显微镜和电子背散射衍射(EBSD)技术分析了变形态和固溶态2124铝合金的微观组织特征,探究了热变形温度对其微观组织的影响。结果表明:热变形温度为360~440℃时,变形态合金微观组织以亚晶为主;随着热变形温度的升高,合金中亚晶占比减少,再结晶组织占比显著增加。经过固溶处理后,热变形温度为360~420℃时,固溶态合金再结晶组织占比约为80%,小角度晶界密度为1.9~5.5 mm/mm^(2);升高温度至460℃时,再结晶组织占比迅速降低到2.3%,小角度晶界密度达到峰值;进一步升高温度到480~500℃时,固溶态合金中再结晶组织占比保持在2%左右,小角度晶界密度降低。The microstructure characteristics of 2124 aluminium alloy at strain rate of 1 s^(-1)and deformation temperature of 360~500℃were studied by hot compression tests.The microstructure characteristics of 2124 aluminium alloy were analyzed by optical microscope and electron backscattering diffraction(EBSD)technology.The effect of thermal deformation temperature on the microstructure of 2124 aluminium alloy was investigated.The results show that the microstructure of the deformed alloy is mainly subcrystalline when the thermal deformation temperature is 360~440℃.With the increase of thermal deformation temperature,the proportion of subcrystalline decreases and the proportion of recrystallization structure increases significantly.After solid solution treatment,the recrystallization structure of the solid solution alloy accounts for about 80%and the small angle grain boundary density is only 1.9~5.5 mm/mm^(2)when the thermal deformation temperature is 360~420℃.Raising the temperature at 460℃,the proportion of recrystallization structure decreases rapidly to 2.3%,and the small angle grain boundary density reaches a peak.Further raising the temperature to 480~500℃,the proportion of recrystallization structure in the solid solution alloy remains about 2%,and the small angle grain boundary density decreases.

关 键 词：2124铝合金 热加工温度 微观组织演变 再结晶组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]