Evolution of Microstructural Characteristics of Rheo-rolling Semi-solid AZ91D Magnesium Alloy

Cheng Shangxu1; Yang Xiangjie2; Guo Hongmin1; Xie Shuisheng3

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Evolution of Microstructural Characteristics of Rheo-rolling Semi-solid AZ91D Magnesium Alloy
Vol. 29, Issue 11, Pages: 1016-1018(2009)
Published： 2009 ，
DOI：

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[1]程尚栩,杨湘杰,郭洪民,谢水生.流变铸轧AZ91D镁合金半固态组织演变特点[J].特种铸造及有色合金,2009,29(11):1016-1018+976.

Cheng Shangxu1, Yang Xiangjie2, Guo Hongmin1, et al. Evolution of Microstructural Characteristics of Rheo-rolling Semi-solid AZ91D Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 29(11):1016-1018(2009)
[1]程尚栩,杨湘杰,郭洪民,谢水生.流变铸轧AZ91D镁合金半固态组织演变特点[J].特种铸造及有色合金,2009,29(11):1016-1018+976. DOI：

Cheng Shangxu1, Yang Xiangjie2, Guo Hongmin1, et al. Evolution of Microstructural Characteristics of Rheo-rolling Semi-solid AZ91D Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 29(11):1016-1018(2009) DOI：

摘要

采用旋转管浇注法制得AZ91D镁合金半固态浆料

在水平双辊铸轧机上进行了流变铸轧试验研究

对铸轧前后组织的特点进行了分析比较。结果表明

铸轧可使初晶更加圆整

620℃浇注温度下

静置时间短

铸轧对初晶圆整化效果更加显著;铸轧后初晶尺寸略微减小

分布更加均匀;铸轧后薄板面上的初晶晶粒密度低于半固态浆料的晶粒密度

620℃浇注温度下

铸轧后晶粒密度显著下降。

Abstract

Semi-solid slurry of AZ91D magnesium alloy was prepared by rotary pouring method

and rheo-rolling experiment was carried out on a horizontal twin-roll caster

furthermore

the microstructure of the alloy before and after rheo-rolling process was analyzed comparatively.The results show that primary phase becomes more rounds after rheo-rolling process.Desirable spheroidization can be observed in the rheo-rolled AZ91D magnesium alloy with pouring at 620℃ and holding for a short time.Average grain size of primary phase is slightly decreased with more homogeneous distribution in the rheo-rolled AZ91D magnesium alloy.Grain density of primary phase in the rheo-rolled AZ91D magnesium alloy sheet surface is less than that in semi-solid slurry.Furthermore

grain density is significantly reduced in the alloy with pouring at 620 ℃ after rheo-rolling.