4.7 Article

Columnar to equiaxed transition in Al-Mg(-Sc)-Zr alloys produced by selective laser melting

期刊

SCRIPTA MATERIALIA
卷 145, 期 -, 页码 113-117

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.10.021

关键词

Selective laser melting; Columnar to equiaxed transition; Aluminium scandium alloys; Thermal gradients; Grain refinement

资金

  1. Australian Research Council [IH130100008]

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The addition of 1.08 wt% Sc to an Al-Mg-Zr alloy produced by selective laser melting modifies the highly coarse columnar grain structure to significantly refined columnar grains separated by sub-micron equiaxed grains at the melt pool boundaries. The latter nucleate mainly from the Al3Sc particles in the remelting zone. An almost fully equiaxed grain structure was achieved by increasing the applied volumetric energy density from 77.1 J/mm(3) to 154.2 J/mm(3) and the platform temperature from 35 degrees C to 200 degrees C, due to the combined effects of potent nuclei, increased remelting zone volumes and reduced thermal gradients. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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