7A55合金铸锭均匀化研究  

Study on homogenization of 7A55 alloy ingot

作　　者：周志军 林顺岩 Zhou Zhijun;Lin Shunyan(Southwest Aluminum(Group)Co.,Ltd.,Chongqing 401326,China)

机构地区：[1]西南铝业(集团)有限责任公司,重庆401326

出　　处：《铝加工》2021年第6期31-36,共6页Aluminium Fabrication

摘　　要：通过硬度和电导率的测量以及金相与电镜分析,研究了7A55铝合金在铸态及不同均匀化条件下组织与性能的变化。结果表明,铸锭经400℃/8 h均匀化处理后,合金电导率急剧下降,硬度急剧上升;经400℃/8h+465℃/Xh均匀化处理后,随二级保温时间增加,合金的电导率先降低后趋于稳定,布氏硬度先升高后趋于稳定;在400℃/8 h+465℃/36 h时,低熔点共晶相回溶充分,晶界残留少量难溶的S相以及Al_(7)Cu_(2)Fe相。考虑到工业化生产实际,400℃/8 h+465℃/36 h为较适宜的7A55合金铸锭的均匀化制度。The changes of microstructure and properties of 7A55 aluminum alloy in as-cast state and under different homogenization conditions were studied by means of hardness and electrical conductivity measurements and metallographic and electron microscope analysis.The results show that after homogenization at 400℃/8h,the electrical conductivity of the alloy decreases sharply and the hardness increases sharply.After homogenization at 400℃/8h+465℃/Xh,with the increase of secondary holding time,the electrical conductivity of the alloy decreases first and then tends to be stable,and the Brinell hardness increases first and then tends to be stable.At 400℃/8h+465℃/36h,the eutectic phase with low melting point is fully dissolved,and a small amount of insoluble S phase and Al_(7)Cu_(2)Fe phase remain at the grain boundary.Considering the actual industrial production,this homogenization system should be selected.

关 键 词：7A55合金 均匀化 电导率 硬度 

分 类 号：TG292[金属学及工艺—铸造]