Microstructure and Properties of Semi-solid Magnesium Alloy feedstock Prepared by Squeeze Casting

Li Dongnan Chen Dinggui Fan Xinfeng

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Microstructure and Properties of Semi-solid Magnesium Alloy feedstock Prepared by Squeeze Casting
Issue S1, Pages: 259-261(2007)
Published：2007
DOI：
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[1]李东南,陈丁桂,范新凤.半固态挤压铸造镁合金坯料组织与性能研究[J].特种铸造及有色合金,2007(S1):259-261. DOI：

Li Dongnan Chen Dinggui Fan Xinfeng. Microstructure and Properties of Semi-solid Magnesium Alloy feedstock Prepared by Squeeze Casting[J]. Special Casting & Nonferrous Alloys, 2007, (S1): 259-261. DOI：

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

5μm。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%。

Abstract

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

5 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.