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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Effect of Sc and Zr on microstructures and mechanical properties of as-cast Al-Mg-Si-Mn alloys
DANG Jing-zhi(党惊知), HUANG Yu-feng(黄玉凤), CHENG Jun(程 军)

School of Materials Science and Engineering, North University of China, Taiyuan 030051, China

Abstract:Microstructures of as-cast Al-Mg-Si-Mn alloys with and without Sc and Zr were investigated by optical microscopy, scanning electronic microscopy(SEM) and energy dispersion spectrum analysis. Addition of 0.2%−0.4% Sc can refine the grain size and change the growth morphology from dendritic to fine equi-axial crystal. The higher the addition of Sc, the finer the as-cast grain size. The tensile strength is increased by more than 30% with 0.4% Sc. Moreover, an addition of 0.1%−0.2% Zr is able to refine grain size and change the growth morphology from dendritic to equi-axial grain too, but less effective. However, Zr is found to increase the ductility of the cast alloys, and the elongation is increased to 11.97% with 0.2% Zr.

 

Key words: Al-Mg alloy; Sc; Zr; microstructure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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