Microstructural Evolution of ZA84 Magnesium Alloy During Semi-solid Isothermal Heat Treatment

Yang Mingbo1; Shen Jia1; Bai Liang2; Pan Fusheng2

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Microstructural Evolution of ZA84 Magnesium Alloy During Semi-solid Isothermal Heat Treatment
Issue 9, Pages: 690-692(2008)
Published： 2008 ，
DOI：

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[1]杨明波,沈佳,白亮,潘复生.ZA84镁合金在半固态等温热处理过程中的组织演变[J].特种铸造及有色合金,2008(09):690-692+653.

Yang Mingbo1, Shen Jia1, Bai Liang2, et al. Microstructural Evolution of ZA84 Magnesium Alloy During Semi-solid Isothermal Heat Treatment. [J]. Special Casting & Nonferrous Alloys (9):690-692(2008)
[1]杨明波,沈佳,白亮,潘复生.ZA84镁合金在半固态等温热处理过程中的组织演变[J].特种铸造及有色合金,2008(09):690-692+653. DOI：

Yang Mingbo1, Shen Jia1, Bai Liang2, et al. Microstructural Evolution of ZA84 Magnesium Alloy During Semi-solid Isothermal Heat Treatment. [J]. Special Casting & Nonferrous Alloys (9):690-692(2008) DOI：

摘要

研究了ZA84镁合金在半固态等温热处理过程中的组织演变。研究结果表明

通过半固态等温热处理制备非枝晶组织ZA84合金是可能的。当ZA84合金经570℃×120min半固态等温热处理后

可获得液相率为22%和未熔初生相颗粒尺寸为57μm的非枝晶组织。ZA84合金在半固态等温热处理过程中的组织演变主要包括最初的粗化、组织分离和球化3个阶段

没有发现球状晶粒最后的粗化。

Abstract

Microstructural evolution of ZA84 magnesium alloy during semi-solid isothermal heat treatment has been observed by SEM （scanning electron microscope） and OM （optical microscope）. It is revealed that it is possible for preparing ZA84 magnesium alloy with non-dendrite structure by semi-solid isothermal heat treatment. After treated at 570 ℃ for 120 min

the non-dendrite structure with 22% liquid phase and un-melted primary solid phase with average size in 57 μm can be observed in the ZA84 alloy. Furthermore

the microstructural evolution of ZA84 magnesium alloy during semi-solid isothermal heat treatment exhibits coarse in beginning

then phase separation and shperoidization

and the final coarsening of spheriodized grain is absent.