期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 19, 期 3, 页码 540-544出版社
ELSEVIER
DOI: 10.1016/S1003-6326(08)60309-X
关键词
Al-Mg alloy; Sc; Zr; microstructure; mechanical properties
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.
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