High temperature transformations of the Au<inf>7</inf>Cu<inf>5</inf>Al <inf>4</inf> shape-memory alloy

Cortie, MB; Kealley, CS; Bhatia, V; Thorogood, GJ; Elcombe, MM; Avdeev, M

High temperature transformations of the Au<inf>7</inf>Cu<inf>5</inf>Al <inf>4</inf> shape-memory alloy

Cortie, MB

Kealley, CS Bhatia, V

Thorogood, GJ Elcombe, MM Avdeev, M

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Publication Type:: Journal Article
Citation:: Journal of Alloys and Compounds, 2011, 509 (8), pp. 3502 - 3508
Issue Date:: 2011-02-24

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Field	Value	Language
dc.contributor.author	Cortie, MB https://orcid.org/0000-0003-3202-6398	en_US
dc.contributor.author	Kealley, CS	en_US
dc.contributor.author	Bhatia, V https://orcid.org/0000-0003-1804-4231	en_US
dc.contributor.author	Thorogood, GJ	en_US
dc.contributor.author	Elcombe, MM	en_US
dc.contributor.author	Avdeev, M	en_US
dc.date.issued	2011-02-24	en_US
dc.identifier.citation	Journal of Alloys and Compounds, 2011, 509 (8), pp. 3502 - 3508	en_US
dc.identifier.issn	0925-8388	en_US
dc.identifier.uri	http://hdl.handle.net/10453/14574
dc.description.abstract	The β-phase of Au7Cu5Al4 undergoes a reversible shape-memory phase transformation, however there has been some uncertainty regarding the crystal structure or structures of the parent phase. Here we show that, under equilibrium conditions, the parent phase possesses the L21 structure between its Ap (about 79 °C) and ∼630 °C, and the B2 primitive cubic structure between ∼630 °C and its melting point. It melts directly from B2 into the liquid state and hence never achieves the random bcc A2 structure that has been previously mooted. Splat-cast samples of the alloy are martensitic, proving that development of equilibrium order and defect concentration are not pre-requisites for the A → M transformation to occur. © 2010 Elsevier B.V. All rights reserved.	en_US
dc.relation.ispartof	Journal of Alloys and Compounds	en_US
dc.relation.isbasedon	10.1016/j.jallcom.2010.12.068	en_US
dc.subject.classification	Materials	en_US
dc.title	High temperature transformations of the Au<inf>7</inf>Cu<inf>5</inf>Al <inf>4</inf> shape-memory alloy	en_US
dc.type	Journal Article
utslib.citation.volume	8	en_US
utslib.citation.volume	509	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0914 Resources Engineering and Extractive Metallurgy	en_US
dc.location.activity	WOS:000287570200016	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.issue	8	en_US
pubs.publication-status	Published	en_US
pubs.volume	509	en_US

Abstract:

The β-phase of Au7Cu5Al4 undergoes a reversible shape-memory phase transformation, however there has been some uncertainty regarding the crystal structure or structures of the parent phase. Here we show that, under equilibrium conditions, the parent phase possesses the L21 structure between its Ap (about 79 °C) and ∼630 °C, and the B2 primitive cubic structure between ∼630 °C and its melting point. It melts directly from B2 into the liquid state and hence never achieves the random bcc A2 structure that has been previously mooted. Splat-cast samples of the alloy are martensitic, proving that development of equilibrium order and defect concentration are not pre-requisites for the A → M transformation to occur. © 2010 Elsevier B.V. All rights reserved.

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http://hdl.handle.net/10453/14574