Formation, modulation and adaptive twinning of martensite in the Au<inf>7</inf>Cu<inf>5</inf>Al<inf>4</inf> shape memory system

Cortie, MB; Levey, FC

Formation, modulation and adaptive twinning of martensite in the Au<inf>7</inf>Cu<inf>5</inf>Al<inf>4</inf> shape memory system

Cortie, MB

Levey, FC

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Publication Type:: Journal Article
Citation:: Intermetallics, 2002, 10 (1), pp. 23 - 31
Issue Date:: 2002-01-01

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Field	Value	Language
dc.contributor.author	Cortie, MB https://orcid.org/0000-0003-3202-6398	en_US
dc.contributor.author	Levey, FC	en_US
dc.date.issued	2002-01-01	en_US
dc.identifier.citation	Intermetallics, 2002, 10 (1), pp. 23 - 31	en_US
dc.identifier.issn	0966-9795	en_US
dc.identifier.uri	http://hdl.handle.net/10453/562
dc.description.abstract	The Au7Cu5Al4 β electron phase transforms displacively from an L21 parent to a nominally body-centred tetragonal martensite with c/a<1. The compound is of interest because it has the potential to serve as an 18 carat shape memory alloy in jewellery. Analysis of its X-ray diffraction spectra indicates that the martensite is modulated by a [110]/[[110][1̄10]]transverse shear wave, showing that it belongs, strictly speaking, to the generic B19 structure type. The martensite is also twinned, and the probable twinning structure is explored. A 15R(9,6̄) stacking sequence is deduced, which for reasons of the L21 ordering inherited from the parent phase, must be doubled to produce a notional 30R(9,6̄,9,6̄) martensite that properly repeats. However, although the measured X-ray diffraction spectra can be substantially explained by the structures derived, the martensite probably also has additional, higher-order lattice modulations. © 2002 Elsevier Science Ltd. All rights reserved.	en_US
dc.relation.ispartof	Intermetallics	en_US
dc.relation.isbasedon	10.1016/S0966-9795(01)00078-4	en_US
dc.subject.classification	Materials	en_US
dc.title	Formation, modulation and adaptive twinning of martensite in the Au<inf>7</inf>Cu<inf>5</inf>Al<inf>4</inf> shape memory system	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	10	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	1007 Nanotechnology	en_US
utslib.for	0306 Physical Chemistry (incl. Structural)	en_US
utslib.for	0914 Resources Engineering and Extractive Metallurgy	en_US
dc.location.activity	University of Melbourne, Australia
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	10	en_US

Abstract:

The Au7Cu5Al4 β electron phase transforms displacively from an L21 parent to a nominally body-centred tetragonal martensite with c/a<1. The compound is of interest because it has the potential to serve as an 18 carat shape memory alloy in jewellery. Analysis of its X-ray diffraction spectra indicates that the martensite is modulated by a [110]/[[110][1̄10]]transverse shear wave, showing that it belongs, strictly speaking, to the generic B19 structure type. The martensite is also twinned, and the probable twinning structure is explored. A 15R(9,6̄) stacking sequence is deduced, which for reasons of the L21 ordering inherited from the parent phase, must be doubled to produce a notional 30R(9,6̄,9,6̄) martensite that properly repeats. However, although the measured X-ray diffraction spectra can be substantially explained by the structures derived, the martensite probably also has additional, higher-order lattice modulations. © 2002 Elsevier Science Ltd. All rights reserved.

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