کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1571590 | 1514421 | 2012 | 7 صفحه PDF | دانلود رایگان |
The effects of Sc content on the microstructure of as-cast Al-Si alloys were investigated by adding 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and 0.4 wt.% Sc to hypoeutectic Al-7 wt.% Si alloys. The results show that there are significant changes in the microstructure when the Sc content is increased to 0.15%. The volume fraction of the primary α-Al phase increased nearly monotonically with increasing Sc content in the as-cast state. As the Sc content increased, the average length of the eutectic Si in the as-cast Al-7Si-xSc alloy decreased sharply from 150 μm (without Sc content) to 20 μm (0.4 wt.% Sc content). The Sc atoms are concentrated in the interdendritic regions. A fish-bone structure composed of Al, Si, Sc, and Fe, which might be the Fe-rich phase precipitated on the AlSc2Si2 (V-phase) was detected adjacent to the grain boundary by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
► Significant changes in the microstructure when the Sc content is increased to 0.15%.
► Volume fraction of the primary a-Al phase increased with increasing Sc content.
► Average length of Si decreased sharply from 150 to 20 μm with increasing Sc content.
► The Sc atoms are concentrated in the interdendritic regions.
Journal: Materials Characterization - Volume 66, April 2012, Pages 104–110