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research article

Understanding variant selection and texture in additively manufactured red-gold alloys

Ghasemi-Tabasi, Hossein  
•
Larcher, MargauxN. D.
•
Cayron, Cyril  
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April 1, 2022
Scripta Materialia

Printing gold alloys parts is a challenge due to the high reflectivity and thermal conductivity of these materials. Recent studies show an improvement in printing gold using the Laser Powder Bed Fusion (L-PBF) process; however, the impact of the A1 -> L1(0) phase transformation on printed red-gold alloy has not been studied. In this work, 3D printed red-gold samples with different post-processing conditions have been heat-treated at 250 degrees C to investigate the effect of the sample stress states on variant selection, by Electron Backscatter Diffraction. Synchrotron X-ray diffraction experiments reveal the presence of a non-negligible amount of tetragonal phase in the as-build red-gold samples. The use of an intermediate heat treatment at 600 degrees C to eliminate small domains of tetragonal phase formed during the manufacturing process demonstrates that the crystallographic textures following heat treatment are highly dependent on the stress-state during the early stage of the phase transformation. (C) 2022 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc.

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Type
research article
DOI
10.1016/j.scriptamat.2021.114490
Web of Science ID

WOS:000788063900014

Author(s)
Ghasemi-Tabasi, Hossein  
Larcher, MargauxN. D.
Cayron, Cyril  
Jhabvala, Jamasp  
Van Petegem, Steven
Kalentics, Nikola E.
Boillat, Eric  
Loge, Roland  
Date Issued

2022-04-01

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

Published in
Scripta Materialia
Volume

211

Article Number

114490

Subjects

Nanoscience & Nanotechnology

•

Materials Science, Multidisciplinary

•

Metallurgy & Metallurgical Engineering

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Science & Technology - Other Topics

•

Materials Science

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laser powder bed fusion (l-pbf)

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red-gold alloy

•

variant selection

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electron backscatter diffraction (ebsd)

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x-ray diffraction

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residual-stress

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kinetics

•

transformation

•

aucu

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMTM  
Available on Infoscience
May 23, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/187988
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