Microstructure and mechanical properties of Gd-modified A356 aluminum alloys
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.%).4 wt.% Gd had an excellent refining effect on...
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Published in | Journal of rare earths Vol. 33; no. 9; pp. 1004 - 1009 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.09.2015
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Subjects | |
Online Access | Get full text |
ISSN | 1002-0721 2509-4963 |
DOI | 10.1016/S1002-0721(14)60518-4 |
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Summary: | 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.%).4 wt.% Gd had an excellent refining effect on primary a-A1 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 GdAleSia compounds, which precipitated in the forms of flakes and bulks. The GdA12Si2 and β-A15FeSi 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. |
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Bibliography: | rare earths; modification; aluminum alloy; microstructure; mechanical property 11-2788/TF 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.%).4 wt.% Gd had an excellent refining effect on primary a-A1 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 GdAleSia compounds, which precipitated in the forms of flakes and bulks. The GdA12Si2 and β-A15FeSi 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. |
ISSN: | 1002-0721 2509-4963 |
DOI: | 10.1016/S1002-0721(14)60518-4 |