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 inJournal of rare earths Vol. 33; no. 9; pp. 1004 - 1009
Main Author 史志铭 王强 史玉亭 赵鸽 张瑞英
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2015
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ISSN1002-0721
2509-4963
DOI10.1016/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.
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