均匀化处理对6063铝合金微观组织结构的影响  

Effect of Homogenization Treatment on Microstructure of 6063 Alloy

作　　者：孙瑜[1] 黄继武[1,2] 赵毅[1] 黄志其[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学有色金属材料科学与工程教育部重点试验室,湖南长沙410083

出　　处：《热加工工艺》2012年第2期187-191,共5页Hot Working Technology

基　　金：广东省-教育部产学研结合项目(2009A080205001)

摘　　要：采用金相显微镜、X射线衍射、扫描电镜、透射电镜和能谱分析技术,研究了均匀化温度和时间对6063合金显微组织的影响。结果表明:铸态合金由过饱和α-Al固溶体和非平衡共晶相组成;铸态合金进行均匀化处理,随温度的升高和保温时间的延长,非平衡共晶组织逐渐消失,合金枝晶偏析逐渐消除;在495℃保温6h,过饱和基体析出Mg2Si相,温度升高到555℃,Mg2Si相完全回溶,针状β-Al9Fe2Si2完全转变为颗粒状α-Al12Fe3Si,同时基体中析出亚微米级AlFeSi和AlFeCrSi相。555℃保温6h退火处理是6063合金铸锭较适宜的均匀化处理工艺。The effects of homogenization treatment on the microstructure of 6063 alloy were investigated using OM,XRD,SEM,EDS and TEM.The results show that the as-cast alloy consists of supersaturated solid solution and unequilibrium eutectic phase.During the homogenization treatment,the eutectic morphology of precipitates and the interdendritic segregation disappears gradually with the increase of annealing temperature or keeping time.Supersaturated solid solution decomposes equilibrium Mg2Si phase at 495 ℃ for 6 h.When the homogenization treatment temperature increasing to 555 ℃ and holding for 6 h,Mg2Si phase dissolves into matrix and acicular β-Al9Fe2Si2 phase transforms into spherical α-Al12Fe3Si phase completely,and some submicron dispersive AlFeSi and AlFeCrSi particles deposites in the alloy.The proper homogenizing process of 6063 alloy is at 555 ℃ for 6 h.

关 键 词：6063铝合金 均匀化 显微组织 AlFeSi相 

分 类 号：TG156.2[金属学及工艺—热处理]