Sr microalloying for refining grain size of AZ91D magnesium alloy

被引：35

作者：

Pan Yichuan ^{[1
]}

Liu Xiangfa ^{[1
]}

Hua, Yang ^{[1
]}

机构：

[1] Shandong Univ, Key Lab Liquid Struct & Heredity Mat, Jinan 250061, Peoples R China

来源：

JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2007年 / 22卷 / 01期

基金：

中国国家自然科学基金;

关键词：

AZ91D; Mg alloy; grain refinement; strontium; heterogeneous nucleation;

D O I：

10.1007/s11595-005-1074-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The grain refining process of an AZ91D Mg alloy by Sr addition was studied and the heterogeneous nucleating particles of alpha-Mg were investigated by electron probe microanalysis (EPMA). With 0.6 wt% Sr addition, the mean grain size of AZ91D alloy was refined from 235.4 mu m to 52.5 mu m at the one-half radius of the ingot. The morphology of primary crystal changed from a sixford symmetrical shape to a petal-like shape. Mg-Sr-Al-Fe-Mn heterogeneous nucleating particles were observed at the grain centers and Sr solute atoms presented segregation along the grain boundaries. Grain refinement was facilitated by both the Mg-Sr-Al-Fe-Mn nucleating particles and the Sr solute atoms, and the former played a dominate role in the process.

引用

页码：74 / 76

页数：3

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