Determination of martensite structures of the Au<inf>7</inf>Cu <inf>5</inf>Al<inf>4</inf> and Au<inf>7</inf>Cu<inf>5.7</inf>Al<inf>3.3</inf> shape-memory alloys

Elcombe, MM; Kealley, CS; Bhatia, VK; Thorogood, GJ; Carter, DJ; Avdeev, M; Cortie, MB

Determination of martensite structures of the Au<inf>7</inf>Cu <inf>5</inf>Al<inf>4</inf> and Au<inf>7</inf>Cu<inf>5.7</inf>Al<inf>3.3</inf> shape-memory alloys

Elcombe, MM Kealley, CS Bhatia, VK

Thorogood, GJ Carter, DJ Avdeev, M Cortie, MB

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Publication Type:: Journal Article
Citation:: Acta Materialia, 2014, 79 pp. 234 - 240
Issue Date:: 2014-08-19

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Field	Value	Language
dc.contributor.author	Elcombe, MM	en_US
dc.contributor.author	Kealley, CS	en_US
dc.contributor.author	Bhatia, VK https://orcid.org/0000-0003-1804-4231	en_US
dc.contributor.author	Thorogood, GJ	en_US
dc.contributor.author	Carter, DJ	en_US
dc.contributor.author	Avdeev, M	en_US
dc.contributor.author	Cortie, MB https://orcid.org/0000-0003-3202-6398	en_US
dc.date.issued	2014-08-19	en_US
dc.identifier.citation	Acta Materialia, 2014, 79 pp. 234 - 240	en_US
dc.identifier.issn	1359-6454	en_US
dc.identifier.uri	http://hdl.handle.net/10453/41217
dc.description.abstract	The β-phase of Au7Cu5Al4 undergoes a reversible shape-memory phase transformation for which several conflicting martensite phases have been reported. Here we show the significance of the cooling temperature used to obtain the martensite. If Au7Cu 5Al4 is cooled from the parent phase condition to cryogenic temperatures, e.g. below 200 K, the martensitic phase is orthorhombic (space group Pcmn, a = 4.4841 Å, b = 5.8996 Å, c = 17.8130 Å); however, when this composition is cooled to only ∼260 K it will in general consist of a mixture of orthorhombic and monoclinic phase (the latter has space group P21/m, a = 4.4742 Å, b = 5.9265 Å, c = 13.3370 Å, β = 91.425°). In contrast, a sample with decreased Al content (Au7Cu5.7Al3.3) transforms fully to monoclinic phase if cooled to ∼260 K. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.	en_US
dc.relation.ispartof	Acta Materialia	en_US
dc.relation.isbasedon	10.1016/j.actamat.2014.07.039	en_US
dc.subject.classification	Materials	en_US
dc.title	Determination of martensite structures of the Au<inf>7</inf>Cu <inf>5</inf>Al<inf>4</inf> and Au<inf>7</inf>Cu<inf>5.7</inf>Al<inf>3.3</inf> shape-memory alloys	en_US
dc.type	Journal Article
utslib.citation.volume	79	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	0913 Mechanical Engineering	en_US
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.publication-status	Published	en_US
pubs.volume	79	en_US

Abstract:

The β-phase of Au7Cu5Al4 undergoes a reversible shape-memory phase transformation for which several conflicting martensite phases have been reported. Here we show the significance of the cooling temperature used to obtain the martensite. If Au7Cu 5Al4 is cooled from the parent phase condition to cryogenic temperatures, e.g. below 200 K, the martensitic phase is orthorhombic (space group Pcmn, a = 4.4841 Å, b = 5.8996 Å, c = 17.8130 Å); however, when this composition is cooled to only ∼260 K it will in general consist of a mixture of orthorhombic and monoclinic phase (the latter has space group P21/m, a = 4.4742 Å, b = 5.9265 Å, c = 13.3370 Å, β = 91.425°). In contrast, a sample with decreased Al content (Au7Cu5.7Al3.3) transforms fully to monoclinic phase if cooled to ∼260 K. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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http://hdl.handle.net/10453/41217