Effect of Cryogenic Treatment on the Phase Transformation Temperatures and Latent Heat of Ni<sub>54</sub>Ti<sub>46</sub> Shape Memory Alloy
Deep cryogenic treatment is characterized by subjecting the material to slow and controlled cooling at temperatures of up to approximately −196 °C or 77 K. This treatment has attracted industry interest and has been used in recent years, with relative success, to improve the properties of metals, es...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-12-01
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| Series: | Materials Proceedings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2673-4605/11/1/2 |
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| Summary: | Deep cryogenic treatment is characterized by subjecting the material to slow and controlled cooling at temperatures of up to approximately −196 °C or 77 K. This treatment has attracted industry interest and has been used in recent years, with relative success, to improve the properties of metals, especially steels. In this article, we provide a preliminary study on the cryogenic soaking time effect of 6, 12, 24, and 36 h on the temperatures and latent transformation heat of the Ni<sub>54</sub>Ti<sub>46</sub> alloy phase. By differential scanning calorimetry (DSC), the properties of samples subjected to different cryogenic soaking times at −196 °C were determined. The results indicated an increase in the phase transformation temperatures present in the alloy and a decrease in the latent heat of transformation in relation to the cryogenic soaking time. The reduction of 9% in the energy involved in the phase transformation was probably due to microstructural changes, and the increase of up to 14.8% in phase transformation temperatures was probably due to stress relief from the reduction of dislocations. |
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| ISSN: | 2673-4605 |