Determination of martensite structures of the Au7Cu5Al4 and Au7Cu5.7Al3.3 shape-memory alloys
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 Au7Cu5Al4 is cooled from the parent phase condition to cryo...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
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Pergamon
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/2938 |
| _version_ | 1848744090559053824 |
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| author | Elcombe, M. Kealley, Cat Bhatia, V. Thorogood, G. Carter, Damien Avdeev, M. Cortie, M. |
| author_facet | Elcombe, M. Kealley, Cat Bhatia, V. Thorogood, G. Carter, Damien Avdeev, M. Cortie, M. |
| author_sort | Elcombe, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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 Au7Cu5Al4 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. |
| first_indexed | 2025-11-14T05:55:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-2938 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T05:55:56Z |
| publishDate | 2014 |
| publisher | Pergamon |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-29382017-09-13T14:33:01Z Determination of martensite structures of the Au7Cu5Al4 and Au7Cu5.7Al3.3 shape-memory alloys Elcombe, M. Kealley, Cat Bhatia, V. Thorogood, G. Carter, Damien Avdeev, M. Cortie, M. Shape memory Neutron diffraction Modulated martensite X-ray diffraction Au–Cu–Al 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 Au7Cu5Al4 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 Journal Article http://hdl.handle.net/20.500.11937/2938 10.1016/j.actamat.2014.07.039 Pergamon restricted |
| spellingShingle | Shape memory Neutron diffraction Modulated martensite X-ray diffraction Au–Cu–Al Elcombe, M. Kealley, Cat Bhatia, V. Thorogood, G. Carter, Damien Avdeev, M. Cortie, M. Determination of martensite structures of the Au7Cu5Al4 and Au7Cu5.7Al3.3 shape-memory alloys |
| title | Determination of martensite structures of the Au7Cu5Al4 and Au7Cu5.7Al3.3 shape-memory alloys |
| title_full | Determination of martensite structures of the Au7Cu5Al4 and Au7Cu5.7Al3.3 shape-memory alloys |
| title_fullStr | Determination of martensite structures of the Au7Cu5Al4 and Au7Cu5.7Al3.3 shape-memory alloys |
| title_full_unstemmed | Determination of martensite structures of the Au7Cu5Al4 and Au7Cu5.7Al3.3 shape-memory alloys |
| title_short | Determination of martensite structures of the Au7Cu5Al4 and Au7Cu5.7Al3.3 shape-memory alloys |
| title_sort | determination of martensite structures of the au7cu5al4 and au7cu5.7al3.3 shape-memory alloys |
| topic | Shape memory Neutron diffraction Modulated martensite X-ray diffraction Au–Cu–Al |
| url | http://hdl.handle.net/20.500.11937/2938 |