Effects of cooling rate on the shape memory effect thermodynamics of NiTi
The cooling rate of near-stoichiometric NiTi after annealing at 500 degree C is shown to have dramatic effects on the transformation thermodynamics. The slower the rate of cooling, the higher the transformation temperatures with less rhombohedral phase (R-phase) observed in room-temperature X-ray di...
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| Veröffentlicht in: | Journal of materials science 1988-12, Vol.23 (12), p.4273-4281 |
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| container_issue | 12 |
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| container_title | Journal of materials science |
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| creator | JARDINE, A. P ASHBEE, K. H. G BASSETT, M. J |
| description | The cooling rate of near-stoichiometric NiTi after annealing at 500 degree C is shown to have dramatic effects on the transformation thermodynamics. The slower the rate of cooling, the higher the transformation temperatures with less rhombohedral phase (R-phase) observed in room-temperature X-ray diffraction spectra. Given that this effect is due to the amount of time spent at intermediate temperatures, i.e an ageing effect, calorimetric analysis of specimens aged at 400 or 450 degree C revealed progressively higher transformation temperatures and latent heats with ageing. These observations are associated with the evolution of a secondary first-order transformation to the R-phase. |
| doi_str_mv | 10.1007/BF00551919 |
| format | Article |
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Given that this effect is due to the amount of time spent at intermediate temperatures, i.e an ageing effect, calorimetric analysis of specimens aged at 400 or 450 degree C revealed progressively higher transformation temperatures and latent heats with ageing. These observations are associated with the evolution of a secondary first-order transformation to the R-phase.</abstract><cop>Heidelberg</cop><pub>Springer</pub><doi>10.1007/BF00551919</doi><tpages>9</tpages></addata></record> |
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| subjects | Cross-disciplinary physics: materials science rheology Exact sciences and technology Materials science Metals, semimetals and alloys Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Specific materials |
| title | Effects of cooling rate on the shape memory effect thermodynamics of NiTi |
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