Martensite destabilization in Au7Cu5Al4 shape-memory alloy
Aging-induced changes in the austenite peak (AP) temperature of Au7Cu5Al4 shape-memory alloy are investigated. Whereas heat treating the parent phase at temperatures >140 degrees C or aging the martensite for long times at room temperature both stabilized the AP to approximately 80 degrees C,...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Pergamon
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/44658 |
| _version_ | 1848757064643379200 |
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| author | Bhatia, V. Kealley, Cat Prior, M. Cortie, M. |
| author_facet | Bhatia, V. Kealley, Cat Prior, M. Cortie, M. |
| author_sort | Bhatia, V. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Aging-induced changes in the austenite peak (AP) temperature of Au7Cu5Al4 shape-memory alloy are investigated. Whereas heat treating the parent phase at temperatures >140 degrees C or aging the martensite for long times at room temperature both stabilized the AP to approximately 80 degrees C, low-temperature excursions into the parent phase caused the subsequent AP to drop to approximately 60 degrees C and the transformation hysteresis to decrease. The evidence indicates that this destabilization of the martensite is caused by time-dependent relaxation of elastic constraint due to parent-phase lath migration during the preceding low-temperature austenitizing treatment. This mechanism of aging is different from that of the better-known symmetry-conforming short-range order phenomenon. |
| first_indexed | 2025-11-14T09:22:09Z |
| format | Journal Article |
| id | curtin-20.500.11937-44658 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:22:09Z |
| publishDate | 2011 |
| publisher | Pergamon |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-446582017-02-28T01:37:53Z Martensite destabilization in Au7Cu5Al4 shape-memory alloy Bhatia, V. Kealley, Cat Prior, M. Cortie, M. Shape-memory alloys Neutron diffraction Aging X-ray diffraction Gold alloys Aging-induced changes in the austenite peak (AP) temperature of Au7Cu5Al4 shape-memory alloy are investigated. Whereas heat treating the parent phase at temperatures >140 degrees C or aging the martensite for long times at room temperature both stabilized the AP to approximately 80 degrees C, low-temperature excursions into the parent phase caused the subsequent AP to drop to approximately 60 degrees C and the transformation hysteresis to decrease. The evidence indicates that this destabilization of the martensite is caused by time-dependent relaxation of elastic constraint due to parent-phase lath migration during the preceding low-temperature austenitizing treatment. This mechanism of aging is different from that of the better-known symmetry-conforming short-range order phenomenon. 2011 Journal Article http://hdl.handle.net/20.500.11937/44658 Pergamon restricted |
| spellingShingle | Shape-memory alloys Neutron diffraction Aging X-ray diffraction Gold alloys Bhatia, V. Kealley, Cat Prior, M. Cortie, M. Martensite destabilization in Au7Cu5Al4 shape-memory alloy |
| title | Martensite destabilization in Au7Cu5Al4 shape-memory alloy |
| title_full | Martensite destabilization in Au7Cu5Al4 shape-memory alloy |
| title_fullStr | Martensite destabilization in Au7Cu5Al4 shape-memory alloy |
| title_full_unstemmed | Martensite destabilization in Au7Cu5Al4 shape-memory alloy |
| title_short | Martensite destabilization in Au7Cu5Al4 shape-memory alloy |
| title_sort | martensite destabilization in au7cu5al4 shape-memory alloy |
| topic | Shape-memory alloys Neutron diffraction Aging X-ray diffraction Gold alloys |
| url | http://hdl.handle.net/20.500.11937/44658 |