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Microstructure and mechanical properties of Gd-modified A356 aluminum alloys
- Source :
- Journal of Rare Earths; September 2015, Vol. 33 Issue: 9 p1004-1009, 6p
- Publication Year :
- 2015
-
Abstract
- The effect of Gd modification on the microstructure and mechanical properties of A356 aluminum alloys was investigated using the metallurgical microscopy, scanning electronic microscopy, X-ray diffraction and mechanical testing. The addition of 0.2 wt.%–0.4 wt.% Gd had an excellent refining effect on primary α-Al grains and a modification effect on Si phases in its as-cast state. The needle-like Si phases were adjusted into fine particles and uniformly distributed in the matrix by the T6 treatment, especially for the 0.2 wt.% Gd-modified alloy. The Gd additions introduced the Fe-containing GdAl2Si2compounds, which precipitated in the forms of flakes and bulks. The GdAl2Si2and β-Al5FeSi phases were also refined by the T6 treatment. The mechanical properties of the Gd-modified alloys were very poor in as-cast state; however, the highest strength and elongation were obtained for the 0.2 wt.% Gd-modified alloy by the T6 treatment.
Details
- Language :
- English
- ISSN :
- 10020721
- Volume :
- 33
- Issue :
- 9
- Database :
- Supplemental Index
- Journal :
- Journal of Rare Earths
- Publication Type :
- Periodical
- Accession number :
- ejs37022896
- Full Text :
- https://doi.org/10.1016/S1002-0721(14)60518-4