半固态挤压铸造镁合金坯料组织与性能研究  

Microstructure and Properties of Semi-solid Magnesium Alloy Billets Prepared by Extruding Casting

作　　者：李东南[1] 陈丁桂[1] 范新凤[1] 

机构地区：[1]福建工程学院材料科学与工程系

出　　处：《特种铸造及有色合金》2007年第12期930-932,共3页Special Casting & Nonferrous Alloys

基　　金：福建省青年人才科技创新基金项目(2006F3004);福建省自然科学基金计划资助项目(E0640002);福建省教育厅科技项目(JA06030)

摘　　要：采用双螺杆机械搅拌法制备半固态镁合金浆料,研究了半固态挤压铸造成形坯料不同部位的组织与性能。结果表明,坯料组织中初生α相呈现不规则的多边形或蔷薇状结构,其晶粒平均直径为45～65μm。坯料边缘和中心部位的组织结构明显不同,边缘处的组织更细小。半固态挤压铸造成形工艺在提高铸件致密度的同时,也提高了铸件的硬度,与液态挤压铸造成形试样相比,其密度提高了0.33%,硬度提高了7.91%。The microstructure and properties of semi-solid magnesium alloy billets prepared by extruding casting were described on the basis of the slurry prepared by two-screw stirring method.The results indicate that the primary α phase in the billets exhibits irregular polygonal or rosette structure with the average size of 45~65 μm.The finer microstructure can be observed in edge of the billets,which is different to structure in center.The extruding casting can improve the density and hardness of semi-solid magnesium alloy components,compared with conventional squeezing casting,increased by 0.33% in density and by 7.91% in hardness.

关 键 词：半固态 镁合金 挤压铸造 组织 性能 

分 类 号：TG249.2[金属学及工艺—铸造]