7075铝合金流变挤压铸造研究  

Rheo-squeeze Casting Process of 7075 Aluminum Alloy

作　　者：王志刚[1] 徐骏[1] 李豹[1] 张志峰[1] 徐蕾[1] 

机构地区：[1]北京有色金属研究总院国家有色金属复合材料工程技术研究中心

出　　处：《特种铸造及有色合金》2014年第1期54-57,共4页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB606302);国家支撑课题资助项目(2011BAE21B01)

摘　　要：通过对7075铝合金熔体进行环缝式电磁搅拌处理,获得具有均匀温度场和成分场的浆料,并采用挤压铸造方式成形,分析了铸件的金相组织,采用ProCAST软件对充型过程进行数值模拟。结果表明,环缝式电磁搅拌处理后的铝合金熔体,凝固过程中的枝晶生长被抑制,铸态组织细化;流变挤压铸造成形件组织致密,减少了热裂、缩松等缺陷的产生。Through annulus electromagnetic stirring（A-EMS）for 7075 aluminum alloy,the slurry with homogeneous temperature field and composition field was prepared to form specimens by rheo-squeeze casting.Microstructure of the specimens prepared was observed.Meanwhile,the filling process was simulated by the ProCAST software.The result shows that the dendritic growth in aluminum alloy after A-EMS is restrained during solidification process,leading to the refinement of the as-cast grain.The specimens formed by rheo-squeeze casting process exhibits sound structure with few casting defects such as hot crack and shrinkage porosity.

关 键 词：7075铝合金 流变挤压铸造 环缝式电磁搅拌 

分 类 号：TG292[金属学及工艺—铸造]