Effect of Sr addition on microstructure of as-cast Mg-Al-Ca alloy

被引：20

作者：

Lou Yan ^{[2
]}

Bai Xing ^{[1
,3
]}

Li Luo-xing ^{[1
,3
]}

机构：

[1] Hunan Univ, State Key Lab Adv Design & Manufacture Vehicle Bo, Changsha 410082, Hunan, Peoples R China

[2] Shenzhen Univ, Coll Mechantron & Control Engn, Shenzhen 518060, Peoples R China

[3] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2011年 / 21卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Mg-Al-Ca alloy; strontium; calcium; microstructure; MECHANICAL-PROPERTIES; MAGNESIUM ALLOY; SI ALLOYS; REFINEMENT; ZN;

D O I：

10.1016/S1003-6326(11)60849-2

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The microstructure evolution of Mg-Al-Ca alloys modified by the addition of strontium was investigated. It was found that Sr addition leads to the coarsening of alpha-Mg matrix. However, with the Sr content increasing from 0.1% to 0.5%, the grain size decreases from 83.9 to 65.8 mu m. The addition of Sr ranging from 0.1% to 0.3% refines the Al2Ca phase. It changes the morphology of the Al2Ca phase from bone-shaped to granular or banding, and increases its volume fraction. The decrease of grain size of the alpha-Mg matrix is due to the increase of the effective undercooling degree of the melt and the constitutional undercooling in a diffusion layer ahead of the advancing solid/liquid interface in the alloy modified by the Sr additions. The modification mechanism of Al2Ca is attributed to the adsorption of Sr additions to the Al2Ca crystal. When the Sr content increases to 0.5%, the alloy is over-modified.

引用

页码：1247 / 1252

页数：6

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