Al-Mg-Si合金在均匀化退火过程中的组织演变  

Microstructure evolution of Al-Mg-Si alloy during homogenization

作　　者：冉继龙 赵经纬 李学云 亓鹏 周青华 赵丕植 丁力群 陈涛 乐启炽[2] 朱庆丰[2] RAN Jilong;ZHAO Jingwei;LI Xueyun;QI Peng;ZHOU Qinghua;ZHAO Pizhi;DING Liqun;CHEN Tao;LE Qichi;ZHU Qingfeng(Chinalco Ruimin Co.,Ltd.,Fuzhou 350015,China;Northeastern University,Liaoning 110819,China;Chinalco Materials Application Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]中铝瑞闽股份有限公司,福建福州350015 [2]东北大学,辽宁110819 [3]中铝材料应用研究院有限公司,北京102209

出　　处：《轻合金加工技术》2024年第5期46-52,共7页Light Alloy Fabrication Technology

基　　金：福建省区域发展项目(2021H4002)。

摘　　要：通过光学显微镜、扫描电镜和差示扫描量热仪等技术手段研究了Al-0.7Mg-0.9Si合金在550℃均匀化退火过程中的显微组织演变。结果表明,合金的铸态组织存在严重偏析,晶界析出长条状Al(Fe, Mn)Si相和短棒状Mg_(2)Si相,晶内析出球状Q-AlCuMgSi相;随着均匀化退火时间的延长,枝晶偏析消失,Q-AlCuMgSi相和Mg_(2)Si相逐步回溶于基体,Al(Fe, Mn)Si相发生断续化转变。合金导电率呈先降低后缓慢升高的趋势。结合均匀化动力学计算,确定Al-Mg-Si合金合理的均匀化退火制度为550℃8 h。The microstructure evolution of Al-0.7Mg-0.9Si alloy during homogenization at 550℃was investigated by optical microscopy,scanning electron microscopy and differential scanning calorimetry.The results show that serious dendritic segregation exists in as-cast alloy,with the long-strip Al(Fe,Mn)Si phase and short-bar Mg_(2)Si phase at grain boundaries,and the spherical Q-AlCuMgSi phase in the grain;with the increase of the homogenization time,the dendritic segregation disappears,and the Q-AlCuMgSi and Mg_(2)Si phases dissolve back to the matrix step by step,and the intermittent transformation of the Al(Fe,Mn)Si phase occurs.The electrical conductivity of the alloy shows a tendency of decreasing and then slowly increasing.Combined with the calculation of homogenization kinetics,a reasonable homogenization heat treatment system for Al-Mg-Si alloy is determined as 550℃8 h.

关 键 词：AL-MG-SI合金 均匀化退火 铸态组织 导电率 第二相 

分 类 号：TG146.21[一般工业技术—材料科学与工程]