Microstructure and mechanical properties of Gd-modified A356 aluminum alloys
来源期刊：JOURNAL OF RARE EARTHS2015年第9期
论文作者：史志铭 王强 史玉亭 赵鸽 张瑞英
文章页码：1004 - 1009
摘 要：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 Gd Al2Si2 compounds, which precipitated in the forms of flakes and bulks. The Gd Al2Si2 and β-Al5 Fe Si 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.
史志铭，王强，史玉亭，赵鸽，张瑞英
School of Materials Science and Engineering, Inner Mongolia University of Technology
摘 要：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 Gd Al2Si2 compounds, which precipitated in the forms of flakes and bulks. The Gd Al2Si2 and β-Al5 Fe Si 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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