Effects of Magnetic Fields on Growth Pattern of Three-dimensional Microstructures in MLED-AM

doi:10.3969/j.issn.1004-132X.2024.11.015

Abstract

Abstract: Magnetic fields of certain strength, in the same and opposite directions to the electric field(that is, cis and reverse magnetic fields), were applied for exploring the influences of magnetic field on growth pattern of three-dimensional nickel microstructure in the MLED-AM processes. A comparative study of the average volumetric deposition rate, surface morphology and grain size during MLED-AM without and with two directions of magnetic field actions was carried out by taking micro-nickel pillars with diameter of 50 μm and aspect ratio of 10∶1 as an example. The experimental results show that the action of magnetic fields may increase the average volumetric deposition rate and further refine the grain size of sedimentary bodies compared to no magnetic field action, and the effects of reverse magnetic field are more significant(the average volumetric deposition rate is increased by 25%~50% and the average grain size may reach 31.52 nm). Meanwhile, the action of magnetic fields may improve the surface morphology of micro-nickel pillars prepared by MLED-AM to a certain extent, and the effects of cis magnetic field are better. According to the experimental results and analysis, the reverse magnetic field has a greater impact on the efficiency and quality of MLED-AM.

Key words: magnetic field, maskless localized electrodeposition(MLED), , additive manufacturing(AM), three-dimensional microstructure, growth pattern

摘要： 为研究磁场对无掩模定域性电沉积增材制造（MLED-AM）金属三维微结构生长模式的作用，以制备直径为50 μm、长径比为10∶1的微镍柱为例，在MLED-AM过程中分别施加一定强度且与电场作用方向相同的顺向磁场和与电场作用方向相反的逆向磁场，通过对比实验探讨磁场对微镍柱平均体积沉积速率、表面形貌及晶粒尺寸的影响规律。实验结果表明，相较于无磁场作用，磁场作用可提高MLED-AM的平均体积沉积速率、细化沉积体的平均晶粒尺寸,且逆向磁场的作用更加显著（平均体积沉积速率提高25%~50%，平均晶粒尺寸达31.52 nm）；同时，磁场作用可在一定程度上改善微镍柱的表面形貌，且顺向磁场作用的效果更好。根据实验结果及分析，逆向磁场作用对MLED-AM效率与质量的影响更大。

关键词: 磁场, 无掩模定域性电沉积, 增材制造, 三维微结构, 生长模式

CLC Number:

TQ153

WU Menghua1, JIANG Bingchun1, XIAO Yuqing2, JIA Weiping2. Effects of Magnetic Fields on Growth Pattern of Three-dimensional Microstructures in MLED-AM[J]. China Mechanical Engineering, 2024, 35(11): 2035-2042.

吴蒙华1, 姜炳春1, 肖雨晴2, 贾卫平2. 磁场对无掩模定域性电沉积增材制造三维微结构生长模式的影响[J]. 中国机械工程, 2024, 35(11): 2035-2042.

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