期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 46, 期 -, 页码 145-155出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.01.037
关键词
AlSi10Mg; Selective laser melting; Atomistic simulation; Material design; Segregation; Corrosion
资金
- National Key Research and Development program of China [2017YFB 0702300]
- Fundamental Research Funds for the Central Universities [FRF-TP-18-002B2]
- National Natural Science Foundation of China [51671029]
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. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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