Effect of casting temperature on halo in the solidification microstructure of direct-chill casting Al-16.5Si-4.5Cu-0.6Mg-0.1Zr alloys

被引：4
|
作者：
Li, Chunyu [1 ]
Liu, Fang [1 ]
Yu, Fuxiao [1 ]
Qiao, Hairong [1 ]
Zheng, Dongpu [1 ]
机构：
[1] Northeastern Univ, Sch Metallurgy, Shenyang 110819, Peoples R China
来源：
MATERIALS LETTERS | 2023年 / 337卷
关键词：
Al -Si alloy; Crystal growth; Halo; Cast; Solidification;
D O I：
10.1016/j.matlet.2022.133779
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of casting temperature on the halo structure of direct-chill (DC) casting Al-16.5Si-4.5Cu-0.6Mg-0.1Zr alloys was investigated. The results indicated that the microstructure consists of fine primary Si, alpha-Al dendrite halo, and fine fibrous coupled eutectic structure, Al2Cu, and Al8FeMg3Si6 phase. The formation of halos was systematically analyzed. The temperature gradient at the solid-liquid interface front played an essential role in the development and growth of the halo. As the casting temperature elevated, the temperature gradient of the solid-liquid interface front increased, the solid-liquid interface became stable, the alpha-Al dendrite halo was less developed, the number of large-sized Si atomic clusters in the melt decreased and the growth of primary Si was inhibited.
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页数：5
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