Design materials based on simulation results of silicon induced segregation at AlSi10Mg interface fabricated by selective laser melting
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第11期
论文作者：Yucheng Ji Chaofang Dong Decheng Kong Xiaogang Li
文章页码：145 - 155
摘 要：AlSi10Mg fabricated by selective laser melting（SLM） had a unique network-like silicon-rich structure, and the mechanism for its formation was explained by molecular dynamics（MD） simulations. The effects of the silicon-rich phase and Mg-containing structure on corrosion were studied by first-principles methods.According to the simulations, corrosion resistant materials were designed, samples with laser powers of 150 W, 200 W and 250 W were fabricated. The results indicated that a local thermal gradient during laser printing caused Si segregation, and the rapid cooling rate lead to a large number of subgrains, which assisted precipitation. The difference in potential caused galvanic corrosion, and a structure with low work function in the molten pool caused pitting. The corrosion resistance of materials processed with a high laser power increased.
Yucheng Ji，Chaofang Dong，Decheng Kong，Xiaogang Li
Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Corrosion and Protection (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing
摘 要：AlSi10Mg fabricated by selective laser melting（SLM） had a unique network-like silicon-rich structure, and the mechanism for its formation was explained by molecular dynamics（MD） simulations. The effects of the silicon-rich phase and Mg-containing structure on corrosion were studied by first-principles methods.According to the simulations, corrosion resistant materials were designed, samples with laser powers of 150 W, 200 W and 250 W were fabricated. The results indicated that a local thermal gradient during laser printing caused Si segregation, and the rapid cooling rate lead to a large number of subgrains, which assisted precipitation. The difference in potential caused galvanic corrosion, and a structure with low work function in the molten pool caused pitting. The corrosion resistance of materials processed with a high laser power increased.
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