On Transformation and Stress–Strain–Temperature Behavior of Fine-Grained Ni-Rich NiTi Wire vs. Aging Mode
The present study was carried out using a cold-drawn wire of Ni<sub>50.8</sub>Ti at.% subjected to post-deformation solution treatment at 700 °C for 1 h to obtain a fine-grained recrystallized structure. Subsequent aging was carried out at a temperature range of 300, 430, and 500 °C for...
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2024-12-01
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| author | Elena Ryklina Kristina Polyakova Victor Komarov Semen Murygin Anton Konopatsky Vladimir Andreev Adilet Ulanov |
| author_facet | Elena Ryklina Kristina Polyakova Victor Komarov Semen Murygin Anton Konopatsky Vladimir Andreev Adilet Ulanov |
| author_sort | Elena Ryklina |
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| description | The present study was carried out using a cold-drawn wire of Ni<sub>50.8</sub>Ti at.% subjected to post-deformation solution treatment at 700 °C for 1 h to obtain a fine-grained recrystallized structure. Subsequent aging was carried out at a temperature range of 300, 430, and 500 °C for 1, 10, and 20 h. The time–temperature aging mode strongly affects the aging-induced microstructure. Variation of the aging-induced microstructure (using various aging modes) permits precise tuning of the characteristic temperature of the martensitic transformations and their specific temperature ranges upon cooling and heating. The latent heat and hysteresis exhibit different evolution vs. aging durations; this finding remains fair when using different aging temperatures. The aging mode strongly affects the stress–temperature behavior: (i) a dramatical expansion of the temperature range of realization of the transformation yield stress (σ<sub>tr</sub>); and (ii) the magnitude of σ<sub>tr</sub> at a chosen test temperature is generally determined by the position of the M<sub>s</sub> temperature. An additional contribution of competing factors is discussed. The efficiency of the aging temperature under isochronous aging is significantly higher than the efficiency of the aging time under isothermal aging. Aging at 430 °C for 10–20 h provides the highest resource for the recovery strain. The strain–temperature behavior strongly depends on the relative position of the R<sub>s</sub> and M<sub>s</sub> temperatures (onset of B2→R and R→B19′ transformations, respectively). The regularities obtained can be used to predict the set of functional and mechanical properties of titanium nickelide. |
| format | Article |
| id | doaj-art-e91d164bd8154b819762b151942e578f |
| institution | Kabale University |
| issn | 2075-4701 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj-art-e91d164bd8154b819762b151942e578f2025-01-24T13:41:22ZengMDPI AGMetals2075-47012024-12-01151310.3390/met15010003On Transformation and Stress–Strain–Temperature Behavior of Fine-Grained Ni-Rich NiTi Wire vs. Aging ModeElena Ryklina0Kristina Polyakova1Victor Komarov2Semen Murygin3Anton Konopatsky4Vladimir Andreev5Adilet Ulanov6Metal Forming Department, National University of Science and Technology “MISIS”, Moscow 119049, RussiaLaboratory Shape Memory Alloys, National University of Science and Technology “MISIS”, Moscow 119049, RussiaLaboratory Shape Memory Alloys, National University of Science and Technology “MISIS”, Moscow 119049, RussiaMetal Forming Department, National University of Science and Technology “MISIS”, Moscow 119049, RussiaInorganic Nanomaterials Research Laboratory, National University of Science and Technology “MISIS”, Moscow 119049, RussiaLaboratory of Plastic Deformation of Metal Materials, Baikov Institute of Metallurgy and Materials Science, Moscow 119991, RussiaMetal Forming Department, National University of Science and Technology “MISIS”, Moscow 119049, RussiaThe present study was carried out using a cold-drawn wire of Ni<sub>50.8</sub>Ti at.% subjected to post-deformation solution treatment at 700 °C for 1 h to obtain a fine-grained recrystallized structure. Subsequent aging was carried out at a temperature range of 300, 430, and 500 °C for 1, 10, and 20 h. The time–temperature aging mode strongly affects the aging-induced microstructure. Variation of the aging-induced microstructure (using various aging modes) permits precise tuning of the characteristic temperature of the martensitic transformations and their specific temperature ranges upon cooling and heating. The latent heat and hysteresis exhibit different evolution vs. aging durations; this finding remains fair when using different aging temperatures. The aging mode strongly affects the stress–temperature behavior: (i) a dramatical expansion of the temperature range of realization of the transformation yield stress (σ<sub>tr</sub>); and (ii) the magnitude of σ<sub>tr</sub> at a chosen test temperature is generally determined by the position of the M<sub>s</sub> temperature. An additional contribution of competing factors is discussed. The efficiency of the aging temperature under isochronous aging is significantly higher than the efficiency of the aging time under isothermal aging. Aging at 430 °C for 10–20 h provides the highest resource for the recovery strain. The strain–temperature behavior strongly depends on the relative position of the R<sub>s</sub> and M<sub>s</sub> temperatures (onset of B2→R and R→B19′ transformations, respectively). The regularities obtained can be used to predict the set of functional and mechanical properties of titanium nickelide.https://www.mdpi.com/2075-4701/15/1/3shape memory alloystitanium nickelideaging-induced microstructuremartensitic transformationslatent heathysteresis |
| spellingShingle | Elena Ryklina Kristina Polyakova Victor Komarov Semen Murygin Anton Konopatsky Vladimir Andreev Adilet Ulanov On Transformation and Stress–Strain–Temperature Behavior of Fine-Grained Ni-Rich NiTi Wire vs. Aging Mode Metals shape memory alloys titanium nickelide aging-induced microstructure martensitic transformations latent heat hysteresis |
| title | On Transformation and Stress–Strain–Temperature Behavior of Fine-Grained Ni-Rich NiTi Wire vs. Aging Mode |
| title_full | On Transformation and Stress–Strain–Temperature Behavior of Fine-Grained Ni-Rich NiTi Wire vs. Aging Mode |
| title_fullStr | On Transformation and Stress–Strain–Temperature Behavior of Fine-Grained Ni-Rich NiTi Wire vs. Aging Mode |
| title_full_unstemmed | On Transformation and Stress–Strain–Temperature Behavior of Fine-Grained Ni-Rich NiTi Wire vs. Aging Mode |
| title_short | On Transformation and Stress–Strain–Temperature Behavior of Fine-Grained Ni-Rich NiTi Wire vs. Aging Mode |
| title_sort | on transformation and stress strain temperature behavior of fine grained ni rich niti wire vs aging mode |
| topic | shape memory alloys titanium nickelide aging-induced microstructure martensitic transformations latent heat hysteresis |
| url | https://www.mdpi.com/2075-4701/15/1/3 |
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