Abstract Pulse magneto-oscillation (PMO) treatment has attracted growing interest as a technique for grain refinement during solidification. Attempts to clarify the effects of PMO treatment parameters have not yet yielded definitive information, because inconsistent results have been reported for the effects of current intensity and pulses frequency on the resulting crystal structures. The present study has investigated the effects of these parameters on the structure of solidified aluminum together with numerical simulations of the effects of electromagnetic field density and applied Lorentz force. It was found that the change in grain size resulting from increasing the electric current intensity, was greater than that resulting from increasing the pulses frequency. However, increasing the current intensity may also increase the induced heat within the charge, thus limiting its refinement efficiency. The simulation calculations showed that once solidification starts, it dramatically decreases the driving force, i.e. the Lorentz force, for grain refinement. This inhibition of the driving force should be taken into consideration in the construction of an efficient electrical system set-up for grain refinement in pure aluminum.

中文翻译：

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电流强度和脉冲频率对脉冲磁振处理纯铝凝固组织的影响

摘要 脉冲磁振荡 (PMO) 处理作为一种在凝固过程中细化晶粒的技术引起了越来越多的兴趣。试图澄清 PMO 处理参数的影响尚未产生明确的信息，因为已经报告了电流强度和脉冲频率对所得晶体结构影响的不一致结果。本研究调查了这些参数对凝固铝结构的影响，以及电磁场密度和施加的洛伦兹力影响的数值模拟。发现增加电流强度引起的晶粒尺寸变化大于增加脉冲频率引起的晶粒尺寸变化。然而，增加电流强度也可能增加电荷内的感应热量，从而限制其精炼效率。模拟计算表明，一旦凝固开始，它会显着降低晶粒细化的驱动力，即洛伦兹力。在构建用于纯铝晶粒细化的有效电气系统设置时，应考虑对驱动力的这种抑制。