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research article

Persistence of variant selection in red gold alloys

Larcher, Margaux N. D.
•
Cayron, Cyril  
•
Blatter, Andreas
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April 5, 2022
Journal Of Alloys And Compounds

Recently, a new thermally activated distortion with amplification (TADA) effect has been reported in red gold alloys caused by the A1 -> L1(0) phase transformation. The macroscopic amplification is due to the persistence of variant selection nucleated under stress but growing in stress-free condition. In this work, we show that the TADA effect can generate a compressive force whose absolute value exceeds 40 MPa in bending and uniaxial loading. Complementary EBSD analyses indicate that the compressive force has no influence on the variant selection initiated under tension. This result confirms that the A1 -> L1(0) disorderorder phase transformation is diffusive, thermodynamically of 1st order, displacive and crystallographically continuous. The TADA force may be exploited for actuators. (C) 2022 The Authors. Published by Elsevier B.V.

  • Details
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Type
research article
DOI
10.1016/j.jallcom.2021.163364
Web of Science ID

WOS:000767378100004

Author(s)
Larcher, Margaux N. D.
Cayron, Cyril  
Blatter, Andreas
Soulignac, Raphaeelle
Loge, Roland E.  
Date Issued

2022-04-05

Publisher

ELSEVIER SCIENCE SA

Published in
Journal Of Alloys And Compounds
Volume

899

Article Number

163364

Subjects

Chemistry, Physical

•

Materials Science, Multidisciplinary

•

Metallurgy & Metallurgical Engineering

•

Chemistry

•

Materials Science

•

variant selection

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electron backscatter diffraction (ebsd)

•

martensitic phase transformation

•

order-disorder phenomena

•

thermally activated processes

•

order-disorder transformation

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phase

•

aucu

•

fields

•

shape

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMTM  
Available on Infoscience
April 11, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/186981
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