| Title： | Effect of wide-spectrum pulsed magnetic field on grain refinement of pure aluminium | |
| Author： | Ya-ming Bai1, Gang Li1, Ya-wei Sun1, *Yong-yong Gong1, 2, and Qi-jie Zhai2, 3 | |
| Address： | 1. College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, China; 2. Center for Advanced Solidification, Shanghai University, 99 Shangda Road, Shanghai 200444, China; 3. School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China | |
| Key words： | wide-spectrum pulsed magnetic field; forced flow; grain refinement; frequency components | |
| CLC Nmuber： | TG146.21 | |
| Document Code： | A | |
| Article ID： | 1672-6421(2023)01-040-09 | |
| Abstract： |
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.
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