合金均匀化过程中的组织演变
(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，北京 100088)
摘 要: 采用光学显微镜、扫描电镜、透射电镜、X射线衍射、差热分析等手段，研究了喷射成形Al-9.97Zn-2.65Mg-1.94Cu-0.12%Zr合金在均匀化过程中微观组织的演变。结果表明：均匀化处理可使合金中的一次析出相明显减少，经470 ℃均匀化处理24 h的Al-9.97Zn-2.65Mg-1.94Cu-0.12%Zr合金的晶粒尺寸没有明显长大，大多数AlZnMgCu四元相回溶到基体中；均匀化态组织除α(Al)外，主要存在3种不同的相，分别为AlZnMgCu四元相、Al9FeNi相以及Al3Zr(L12) 弥散粒子。
关键字: 喷射成形；均匀化处理；Al-Zn-Mg-Cu合金
（State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
General Research Institute For Nonferrous Metals, Beijing 100088, China）
Abstract:Microstructural evolution of spray formed Al-9.97Zn-2.65Mg-1.94Cu-0.12%Zr alloy during homogenization was studied by using optical microscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffractometry and differential scanning calorimetry. The results show that the homogenization can decrease the primary precipitates of the alloy obviously, and the coarsening of the grains is not obvious during homogenization treatment at 470 ℃ for 24 h, and most of the AlZnMgCu phases are dissolved into the matrix. After homogenization, the microstructure of the alloy is composed of α(Al), AlZnMgCu phases, Al9FeNi phases and Al3Zr (L12) dispersoids.
Key words: spray-formed; homogenization; Al-Zn-Mg-Cu alloy
