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

Kun V. Yang; Yunjia Shi; Frank Palm; Xinhua Wu; Paul Rometsch

doi:10.1016/j.scriptamat.2017.10.021

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

Kun V. Yang, Yunjia Shi, Frank Palm, Xinhua Wu, Paul Rometsch

Materials Science & Engineering

Research output: Contribution to journal › Article › Research › peer-review

264 Citations (Scopus)

Abstract

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/mm³ to 154.2 J/mm³ and the platform temperature from 35 °C to 200 °C, due to the combined effects of potent nuclei, increased remelting zone volumes and reduced thermal gradients.

Original language	English
Pages (from-to)	113-117
Number of pages	5
Journal	Scripta Materialia
Volume	145
DOIs	https://doi.org/10.1016/j.scriptamat.2017.10.021
Publication status	Published - 1 Mar 2018

Keywords

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

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10.1016/j.scriptamat.2017.10.021

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

abstract = "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/mm3 to 154.2 J/mm3 and the platform temperature from 35 °C to 200 °C, due to the combined effects of potent nuclei, increased remelting zone volumes and reduced thermal gradients.",

keywords = "Aluminium‑scandium alloys, Columnar to equiaxed transition, Grain refinement, Selective laser melting, Thermal gradients",

author = "Yang, {Kun V.} and Yunjia Shi and Frank Palm and Xinhua Wu and Paul Rometsch",

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T1 - Columnar to equiaxed transition in Al-Mg(-Sc)-Zr alloys produced by selective laser melting

AU - Yang, Kun V.

AU - Shi, Yunjia

AU - Palm, Frank

AU - Wu, Xinhua

AU - Rometsch, Paul

PY - 2018/3/1

Y1 - 2018/3/1

N2 - 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/mm3 to 154.2 J/mm3 and the platform temperature from 35 °C to 200 °C, due to the combined effects of potent nuclei, increased remelting zone volumes and reduced thermal gradients.

AB - 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/mm3 to 154.2 J/mm3 and the platform temperature from 35 °C to 200 °C, due to the combined effects of potent nuclei, increased remelting zone volumes and reduced thermal gradients.

KW - Aluminium‑scandium alloys

KW - Columnar to equiaxed transition

KW - Grain refinement

KW - Selective laser melting

KW - Thermal gradients

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DO - 10.1016/j.scriptamat.2017.10.021

M3 - Article

AN - SCOPUS:85032192797

SN - 1359-6462

VL - 145

SP - 113

EP - 117

JO - Scripta Materialia

JF - Scripta Materialia

ER -

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

Abstract

Keywords

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

Abstract

Keywords

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Centre for Additive Manufacturing (MCAM)

Centre for Electron Microscopy (MCEM)

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