结晶过程中合金粉末的加入对Al-Cu合金凝固组织的影响  

Influence of powder addition in the crystallization process on solidification microstructure of Al-Cu alloys

作　　者：何建军[1] 陈荐[1] 任延杰[1] 邱玮[1] 

机构地区：[1]长沙理工大学能源与动力工程学院,湖南长沙410114

出　　处：《轻金属》2010年第8期70-73,共4页Light Metals

基　　金：湖南省自然科学基金重点项目(09JJ3097);湖南省重点学科资助项目(080703)

摘　　要：在固液混合铸造工艺中,将Al-20Cu合金粉末分别加入到Al-20Cu和Al-40Cu合金熔体中制备了合金坯料。采用JSM-6700F扫描电子显微镜对合金坯料的显微组织进行观测。研究结果表明:Al-20Cu粉末加入对粉末周围的Al-20Cu合金基体初生相、共晶组织和二次析出相有明显的细化作用,越靠近未熔粉末,基体中的初生相越细小,共晶组织的片间距越小。固液混合铸造Al-40Cu合金坯料中未熔Al-20Cu合金粉末与基体界面结合良好,表明固液混合铸造工艺中加入的金属粉末的成分范围可以进行扩展。In solid - liquid mixed casting process, Al - 20Cu alloy powders were added into Al - 20Cu alloy and Al - 40Cu alloy melt separately to prepare alloys, then the microstructures of the as cast alloys were studied by JSM - 6700F SEM. The research results show that the added Al - 20Cu alloy powders can fine the primary phase, eutectics and the secondary - precipitated phases of Al -20Cu alloys obviously. The closer to the no - melting powders, the finer primary precipitated phases and eutectic lamellar pacing can be obtained. There exit an excellent interface between no - melting Al - 20Cu alloy powders and Al-40Cu alloy matrix, so the composition of added powders can be extended in the solid- liquid mixed casting process.

关 键 词：铸造 固液混合铸造 Al—Cu合金 合金粉末 显微组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]