Formation of the solidified microstructure of Mg-Al-Zn alloy under a low-voltage pulsed magnetic field

被引：14

作者：

Fu, J. W. ^{[1
]}

Yang, Y. S. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH | 2011年 / 26卷 / 14期

基金：

中国国家自然科学基金;

关键词：

ELECTRIC-CURRENT PULSE; DIRECTIONAL SOLIDIFICATION; MORPHOLOGICAL INSTABILITY; STRUCTURE REFINEMENT; DENDRITIC GROWTH; GRAIN-REFINEMENT; STAINLESS-STEEL; PURE ALUMINUM; STABILITY; INTERFACE;

D O I：

10.1557/jmr.2011.159

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Effect of a low-voltage pulsed magnetic field (LVPMF) on the solidified microstructure of Mg-Al-Zn alloy has been investigated. Experimental results show that the solidified structure of Mg-Al-Zn alloy can be remarkably refined and that the morphology of alpha-Mg is transformed from developed dendrite to fine rosette with the application of LVPMF. Magnetization of the solute and solvent in the diffusion layer cannot account for the formation of the rosette alpha-Mg under LVPMF. A model for the formation of rosette alpha-Mg under LVPMF has been developed by analyzing the growth behavior of alpha-Mg dendrite. Morphology change of alpha-Mg dendrite under LVPMF is caused by Joule heat concentrated on the dendrite tip. Accumulation of Joule heat on the dendrite tip melts the local dendrite tip and increases the radius of curvature. The increased radius of curvature at the dendrite tip lowers the growth rate and results in the formation of rosette alpha-Mg.

引用

页码：1688 / 1695

页数：8

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