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Grain refinement in laser remelted Mg-3Nd-1Gd-0.5Zr alloy

journal contribution
posted on 01.07.2020, 00:40 by Duyao Zhang, Mark Easton, Dong Qiu
Remarkable grain refinment is achieved in a Mg alloy by laser surface remelting process.

From related journal article abstract: "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 µm to 3.5 µm, 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."


ARC Grant: LP150100950

ARC Research Hub for Advanced Manufacturing of Personalised Medical Devices

Australian Research Council

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RMIT University