Evolution of thermal and mechanical properties of Nitinol wire as a function of ageing treatment conditions
As-received and cold-worked 55Ni–45Ti wt% Nitinol wire samples were subjected to various ageing treatments. Experiments show that the properties of as-received Nitinol, including microstructure, critical temperatures in thermally induced phase transformation, and critical stresses/strains in mechani...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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Elsevier
2019
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| _version_ | 1797065838733295616 |
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| author | Wang, Z Everaerts, J Salvati, E Korsunsky, A |
| author_facet | Wang, Z Everaerts, J Salvati, E Korsunsky, A |
| author_sort | Wang, Z |
| collection | OXFORD |
| description | As-received and cold-worked 55Ni–45Ti wt% Nitinol wire samples were subjected to various ageing treatments. Experiments show that the properties of as-received Nitinol, including microstructure, critical temperatures in thermally induced phase transformation, and critical stresses/strains in mechanically induced phase transformation, change significantly after ageing process at 773 K for different durations ranging from 10 min to 5 h. BSE and EBSD/EDS analysis shows that the predominant microstructural evolution is a large increase in Ni4Ti3 precipitate volume fraction, while grain growth is negligible. DSC results show that as-received material exhibits little to no phase transformation during heating-cooling cycling at 5K/min, while various ageing durations lead to the emergence of phase transformation that occurs at different critical temperatures. Tensile loading experiments conducted using a test rig equipped with a heater revealed the evolution of mechanically induced phase transformation behaviour. Mathematical models are proposed to predict the dependence of critical temperatures and critical stresses/strains on the ageing treatment conditions and alloy composition. |
| first_indexed | 2024-03-06T21:34:20Z |
| format | Journal article |
| id | oxford-uuid:45b710c5-cbb2-4c37-b43c-4fc596558e72 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:34:20Z |
| publishDate | 2019 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:45b710c5-cbb2-4c37-b43c-4fc596558e722022-03-26T15:09:28ZEvolution of thermal and mechanical properties of Nitinol wire as a function of ageing treatment conditionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:45b710c5-cbb2-4c37-b43c-4fc596558e72EnglishSymplectic Elements at OxfordElsevier2019Wang, ZEveraerts, JSalvati, EKorsunsky, AAs-received and cold-worked 55Ni–45Ti wt% Nitinol wire samples were subjected to various ageing treatments. Experiments show that the properties of as-received Nitinol, including microstructure, critical temperatures in thermally induced phase transformation, and critical stresses/strains in mechanically induced phase transformation, change significantly after ageing process at 773 K for different durations ranging from 10 min to 5 h. BSE and EBSD/EDS analysis shows that the predominant microstructural evolution is a large increase in Ni4Ti3 precipitate volume fraction, while grain growth is negligible. DSC results show that as-received material exhibits little to no phase transformation during heating-cooling cycling at 5K/min, while various ageing durations lead to the emergence of phase transformation that occurs at different critical temperatures. Tensile loading experiments conducted using a test rig equipped with a heater revealed the evolution of mechanically induced phase transformation behaviour. Mathematical models are proposed to predict the dependence of critical temperatures and critical stresses/strains on the ageing treatment conditions and alloy composition. |
| spellingShingle | Wang, Z Everaerts, J Salvati, E Korsunsky, A Evolution of thermal and mechanical properties of Nitinol wire as a function of ageing treatment conditions |
| title | Evolution of thermal and mechanical properties of Nitinol wire as a function of ageing treatment conditions |
| title_full | Evolution of thermal and mechanical properties of Nitinol wire as a function of ageing treatment conditions |
| title_fullStr | Evolution of thermal and mechanical properties of Nitinol wire as a function of ageing treatment conditions |
| title_full_unstemmed | Evolution of thermal and mechanical properties of Nitinol wire as a function of ageing treatment conditions |
| title_short | Evolution of thermal and mechanical properties of Nitinol wire as a function of ageing treatment conditions |
| title_sort | evolution of thermal and mechanical properties of nitinol wire as a function of ageing treatment conditions |
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