Microstructure of Spray-formed Mg-4Al-3Ca-1.5Zn Alloy

Li Xuan; Chen Wei; Zhao Baorong; Xin Haiying; Zhai Jing; Chen Gang; Zhang Guowei

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Microstructure of Spray-formed Mg-4Al-3Ca-1.5Zn Alloy
Vol. 31, Issue 3, Pages: 272-274(2011)
Published： 2011 ，
DOI：

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[1]李旋,陈伟,赵宝荣,辛海鹰,翟景,陈刚,章国伟.喷射沉积Mg-4Al-3Ca-1.5Zn合金的显微组织[J].特种铸造及有色合金,2011,31(03):272-274+194-195.

Li Xuan, Chen Wei, Zhao Baorong, et al. Microstructure of Spray-formed Mg-4Al-3Ca-1.5Zn Alloy. [J]. Special Casting & Nonferrous Alloys 31(3):272-274(2011)
[1]李旋,陈伟,赵宝荣,辛海鹰,翟景,陈刚,章国伟.喷射沉积Mg-4Al-3Ca-1.5Zn合金的显微组织[J].特种铸造及有色合金,2011,31(03):272-274+194-195. DOI：

Li Xuan, Chen Wei, Zhao Baorong, et al. Microstructure of Spray-formed Mg-4Al-3Ca-1.5Zn Alloy. [J]. Special Casting & Nonferrous Alloys 31(3):272-274(2011) DOI：

摘要

采用扫描电镜、透射电镜等方法对喷射沉积Mg-4Al-3Ca-1.5Zn合金的组织变化进行了试验研究。结果表明

金属型铸态合金中强化相沿晶界析出

主要成分为C36[（Mg

Al）2Ca]和C14（Mg2Ca）相;而喷射沉积快速凝固的合金组织均匀

强化相为C15（Al2Ca）和C36相

其中C15相以棒状和粒状分布于C36基体中;C36相处于亚稳态

经过高温保温处理会转变为C15相;热挤压过程中合金发生动态再结晶

在晶界处有C36相析出。

Abstract

Microstructure evolution of spray-formed Mg-4Al-3Ca-1.5Zn alloy was observed by SEM （scanning electron microscope） and TEM （transmission electron microscope）. The results reveal that strengthening phase in permanent mold casting alloy is precipitated along grain boundary

which is composed of C36\[（Mg

Al）2Ca\] and C14 phase （Mg2Ca）. Uniformly distributed microstructure in spray-formed alloy can be observed

and strengthening phase is composed of C15 （Al2Ca） and C36 phases

in which rod or particle C15 phases are distributed into C36 matrix. Metastable C36 phase can be transformed into C15 phase after heeting treatment at high temperature. Dynamic recrystallization occurs in the alloy during hot extrusion process

and C36 phase is precipitated along grain boundaries.