Al-Mg-Si-Cu-Mn-Cr合金均匀化退火工艺研究  

Study on homogenization annealing of Al-Mg-Si-Cu-Mn-Cr alloy

作　　者：顾凤仙[1] 韩逸[1] 马科[1] 长海博文 

机构地区：[1]苏州有色金属研究院有限公司,江苏苏州215026

出　　处：《轻合金加工技术》2013年第1期23-27,共5页Light Alloy Fabrication Technology

摘　　要：采用光学显微镜(OM)、差示扫描量热分析(DSC)、扫描电镜(SEM)、能谱分析(EDS)等分析方法研究了Al-Mg-Si-Cu-Mn-Cr合金铸锭的均匀化退火工艺。试验结果表明,该合金铸态组织中存在大量的非平衡低熔点共晶相,其初始熔化温度为574℃;合金铸态组织相组成包括α-Al、Mg2Si、Al15(Fe,Mn,Cr)3Si2及少量含Cu相;随着均匀化退火温度的升高和保温时间的延长,低熔点共晶相逐渐溶入基体;该合金铸锭适宜的均匀化退火工艺制度为560℃(4h～6 h)。The homogenization annealing of Al-Mg-Si-Cu-Mn-Cr alloy have been studied by OM, DSC, SEM and EDS techniques. Results show that a lot of non-equilibrium low-melting eutectics exist in the cast structure of the experimental alloy, whose initial melting temperature is 574℃. The cast structure is composed with α-Al, Mg2Si,Al15 （Fe,Mn,Cr）3Si2 phases and a few copper-containing phases. With the homogenization temperature increasing and holding time elongating, the low-melting eutectics can dissolve into the matrix gradually. The optimum homogenizing annealing process for the alloy is 560℃ （4 h -6 h）.

关 键 词：Al-Mg-Si-Cu-Mn-Cr合金 均匀化 显微组织 热分析 

分 类 号：TG156.2[金属学及工艺—热处理]