Al-4Cu-Mg-Er合金均匀化制度研究  

Research on Homogenization Processes of Al-4Cu-Mg-Er Alloy

作　　者：宁爱林[1] 邹利华[1] 宁康琪[1] 彭北山[1] 

机构地区：[1]邵阳学院机械与能源工程系,湖南邵阳422000

出　　处：《热加工工艺》2012年第16期165-167,共3页Hot Working Technology

基　　金：湖南省自然科学基金资助项目(08JJ3101)

摘　　要：通过扫描电镜观察、XRD物相定性分析,研究了Al-4Cu-Mg-Er合金相组成及其均匀化制度。结果表明:Er元素主要以Al8Cu4Er相形式存在于铸态合金中;Al8Cu4Er相与Al2Cu相在合金铸态组织中共生于晶界,形成典型的枝晶偏析;Al8Cu4Er相在合金晶界凝固时比Al2Cu相优先析出,生长为典型的枝晶组织。与Al2Cu相相比较,Al8Cu4Er相的熔点较高,为难溶相,成为该合金均匀化制度的制约因素。经400℃×6h+495℃×24h均匀化处理后,Al8Cu4Er相回溶至基体,合金晶界变薄,均匀化效果明显。Precipitation sequence and homogenization process of Al-4Cu-Mg-Er alloy were investigated by SEM and XRD.The results indicate that Er element is mainly contained in Al8Cu4Er,the intergrowth of Al8Cu4Er and Al2Cu are found in the grain boundary,typical dentritic structure is formed because of the preferential precipitation of Al8Cu4Er.Al8Cu4Er which has a higher melting-point is the refractory phase that constrained the homogenization process.A homogenization process of 400 ℃× 6 h ＋ 495 ℃×24 h accomplishes re-solution of excess Al8Cu4Er and improves the uniform component perfectly.

关 键 词：铝合金 均匀化退火 微观组织 

分 类 号：TG146[一般工业技术—材料科学与工程]