期刊
SCRIPTA MATERIALIA
卷 183, 期 -, 页码 12-16出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.03.006
关键词
Magnesium alloys; Rapid solidification; Solidification microstructure; Grain refining; Laser treatment
类别
资金
- Australian Research Council (ARC) [LP150100950]
- ARC Research Hub for Advanced Manufacturing of Medical Devices [IH150100024]
- Australian Research Council [LP150100950] Funding Source: Australian Research Council
Columnar grains are normally favoured with the high cooling rate and steep thermal gradient in laser-based additive manufacturing. Here, we demonstrate that fine, fully equiaxed grains can be achieved in Mg-3Nd-1Gd-0.5Zr (EV31) alloy by laser surface remelting. The grains in the melt pool are remarkably refined from 74 mu m to 3.5 mu m, which can be attributed to the growth restriction effect, i.e. the constitutional supercooling formed by Zr solute during solidification in combination with the high cooling rate imposed by laser surface remelting. This novel finding could be applied for the control of grain morphology and alloy design for additive manufacturing applications. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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