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

Li Dongnan; Chen Dinggui; Fan Xinfeng

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Microstructure and Properties of Semi-solid Magnesium Alloy Billets Prepared by Extruding Casting
Issue 12, Pages: 930-932(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(12):930-932+899.

Li Dongnan, Chen Dinggui, Fan Xinfeng. Microstructure and Properties of Semi-solid Magnesium Alloy Billets Prepared by Extruding Casting. [J]. Special Casting & Nonferrous Alloys (12):930-932(2007)
[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(12):930-932+899. DOI：

Li Dongnan, Chen Dinggui, Fan Xinfeng. Microstructure and Properties of Semi-solid Magnesium Alloy Billets Prepared by Extruding Casting. [J]. Special Casting & Nonferrous Alloys (12):930-932(2007) 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45～65μm。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%。

Abstract

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

5 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.