Al-4.14Cu-1.51Li合金均匀化工艺研究

Research on Homogenization Process of Al-4.14Cu-1.51Li Alloy

以自行熔铸的铝铜锂合金为研究对象,利用扫描电镜、金相显微镜等研究其均匀化工艺。实验结果表明:其铸态合金有明显的枝晶结构,且具有Al_(2)Cu、Al_(2)CuMg等粗大第二相。一级均匀化后,粗大相并无显著减少。另外最佳二级均匀化工艺是460℃/8 h+515℃/24 h,此时粗大相大幅减少,残留的是AlCu相以及可能的Al_(2)Cu相和AlCuFeMn相聚集体;且经过均匀化动力学验证,第二级均匀化时间与实验结果相匹配。

Taking self-melting Al-Cu-Li alloy as the research object,the homogenization process of Al-Cu-Li alloy was studied by using scanning electron microscope,metallographic microscope and other instruments.The experimental results show that the as-cast alloy has obvious dendritic structure,and has coarse second phases such as Al_(2)Cu,Al_(2)CuMg,etc.After the first level homogenization,the coarse phases are not significantly reduced.In addition,the best secondary homogenization process is 460℃/8 h+515℃/24 h.At this time,the coarse phases are greatly reduced,and the residues are the AlCu phase as well as the possible Al_(2)Cu phase and AlCuFeMn gathering collective.After homogenization kinetics verification,the second level homogenization time matches the experimental results.