Effect of wide-spectrum pulsed magnetic field on grain refinement of pure aluminium

被引：5
|
作者：
Bai, Ya-ming [1 ]
Li, Gang [1 ]
Sun, Ya-wei [1 ]
Gong, Yong-yong [1 ,2 ]
Zhai, Qi-jie [2 ,3 ]
机构：
[1] Shanghai Univ, Coll Sci, 99 Shangda Rd, Shanghai 200444, Peoples R China
[2] Shanghai Univ, Ctr Adv Solidificat, 99 Shangda Rd, Shanghai 200444, Peoples R China
[3] Shanghai Univ, Sch Mat Sci & Engn, 99 Shangda Rd, Shanghai 200444, Peoples R China
来源：
CHINA FOUNDRY | 2023年 / 20卷 / 01期
基金：
中国国家自然科学基金;
关键词：
wide-spectrum pulsed magnetic field; forced flow; grain refinement; frequency components; TG146; 21; A; SOLIDIFICATION STRUCTURE; AL; ALLOY; MECHANISM; MICROSTRUCTURE;
D O I：
10.1007/s41230-023-1108-8
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A wide-spectrum pulsed magnetic field (WSPMF) was obtained by adjusting the number of current pulses and the pulse interval between adjacent pulses. The effect of WSPMF on the grain refinement of pure aluminium was studied. The distribution of electromagnetic force and flow field in the melt under the WSPMF was simulated to reveal the grain refining mechanism. Results show that the grain refinement is attributed to the combined effect of the melt flow and oscillation under a WSPMF. When the pulse interval is 5 ms, the extreme value of electromagnetic force is the highest, and the size of the crystal nucleus is 0.35 mm. In the case of similar flow rates, the grain size gradually decreases as the pulse interval increases. The range of the harmonic frequency of the magnetic field gradually expands with the increase of the pulse interval, which can provide more energy for nucleation at the solid-liquid interface and promote nucleation.
引用
收藏
页码：40 / 48
页数：9
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