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 feedstock Prepared by Squeeze Casting

作　　者：李东南 陈丁桂 范新凤 

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S1期259-261,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(2006J0438);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4.78%。Based on the semi-solid slurry was prepared by twin-screw stirring,the microstructure and properties of semi-solid magnesium alloy feedstock formed by squeeze casting was investigated.The results show that the structure of primary α-Mg phase in feedstock is polygon or rosette,and the average size of grains is 45 μm^65 μm.The structure of primary α-Mg in the edge and the center of feedstock is different,and the grain size of feedstock edge is finer.Meanwhile,the density and hardness of semi-solid feedstock of magnesium alloy are increased in comparison with the sample fabricated by liquid squeeze casting,the density and hardness are increased by 0.33%and 4.78%,respectively.

关 键 词：半固态 镁合金 挤压铸造 组织 性能 

分 类 号：TG249.7[金属学及工艺—铸造]