Effect of <i>abc</i> Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%)
This paper presents experimental data on the microstructure and martensite transformation temperatures of Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) after <i>abc</i> pressing (multi-axial forging) to different true strains <b><i>e</i></b> fro...
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MDPI AG
2021-07-01
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| Online Access: | https://www.mdpi.com/2075-4701/11/7/1145 |
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| author | Oleg Kashin Aleksandr Ivanovich Lotkov Victor Grishkov Konstantin Krukovskii Dorzhima Zhapova Yuri Mironov Natalia Girsova Olga Kashina Elena Barmina |
| author_facet | Oleg Kashin Aleksandr Ivanovich Lotkov Victor Grishkov Konstantin Krukovskii Dorzhima Zhapova Yuri Mironov Natalia Girsova Olga Kashina Elena Barmina |
| author_sort | Oleg Kashin |
| collection | DOAJ |
| description | This paper presents experimental data on the microstructure and martensite transformation temperatures of Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) after <i>abc</i> pressing (multi-axial forging) to different true strains <b><i>e</i></b> from 1.84 to 9.55 at 573 K. The data show that increasing the true strain results in grain–subgrain refinement on different scales at a time. With <b><i>e</i></b> = 9.55 at 573 K, the average grain–subgrain size measured approximately 130 nm. Decreasing the <i>abc</i> pressing temperature from 723 to 573 K caused a decrease in all martensite transformation temperatures, a change in the lattice parameters, R phase formation, and angular shifts of diffraction peaks and their broadening. The largest change in the microstructure of Ti<sub>49.8</sub>Ni<sub>50.2</sub> was provided by <i>abc</i> pressing to <b><i>e</i></b> = 1.84. Increasing the true strain to <b><i>e</i></b> = 9.55 resulted in a much smaller effect, suggesting that the alloy obtained a high density of structural defects even at <b><i>e</i></b> = 1.84. Two possible mechanisms of grain–subgrain refinement are discussed. |
| first_indexed | 2024-03-10T09:31:59Z |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T09:31:59Z |
| publishDate | 2021-07-01 |
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| series | Metals |
| spelling | doaj.art-f1ef7d34621d479e9ba3ee7a6da142b72023-11-22T04:24:28ZengMDPI AGMetals2075-47012021-07-01117114510.3390/met11071145Effect of <i>abc</i> Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%)Oleg Kashin0Aleksandr Ivanovich Lotkov1Victor Grishkov2Konstantin Krukovskii3Dorzhima Zhapova4Yuri Mironov5Natalia Girsova6Olga Kashina7Elena Barmina8Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, RussiaThis paper presents experimental data on the microstructure and martensite transformation temperatures of Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) after <i>abc</i> pressing (multi-axial forging) to different true strains <b><i>e</i></b> from 1.84 to 9.55 at 573 K. The data show that increasing the true strain results in grain–subgrain refinement on different scales at a time. With <b><i>e</i></b> = 9.55 at 573 K, the average grain–subgrain size measured approximately 130 nm. Decreasing the <i>abc</i> pressing temperature from 723 to 573 K caused a decrease in all martensite transformation temperatures, a change in the lattice parameters, R phase formation, and angular shifts of diffraction peaks and their broadening. The largest change in the microstructure of Ti<sub>49.8</sub>Ni<sub>50.2</sub> was provided by <i>abc</i> pressing to <b><i>e</i></b> = 1.84. Increasing the true strain to <b><i>e</i></b> = 9.55 resulted in a much smaller effect, suggesting that the alloy obtained a high density of structural defects even at <b><i>e</i></b> = 1.84. Two possible mechanisms of grain–subgrain refinement are discussed.https://www.mdpi.com/2075-4701/11/7/1145TiNiisothermal <i>abc</i> pressingmicrostructuregrain–subgrain refinementmartensite transformation temperatures |
| spellingShingle | Oleg Kashin Aleksandr Ivanovich Lotkov Victor Grishkov Konstantin Krukovskii Dorzhima Zhapova Yuri Mironov Natalia Girsova Olga Kashina Elena Barmina Effect of <i>abc</i> Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) Metals TiNi isothermal <i>abc</i> pressing microstructure grain–subgrain refinement martensite transformation temperatures |
| title | Effect of <i>abc</i> Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) |
| title_full | Effect of <i>abc</i> Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) |
| title_fullStr | Effect of <i>abc</i> Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) |
| title_full_unstemmed | Effect of <i>abc</i> Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) |
| title_short | Effect of <i>abc</i> Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti<sub>49.8</sub>Ni<sub>50.2</sub> (at%) |
| title_sort | effect of i abc i pressing at 573 k on the microstructure and martensite transformation temperatures in ti sub 49 8 sub ni sub 50 2 sub at |
| topic | TiNi isothermal <i>abc</i> pressing microstructure grain–subgrain refinement martensite transformation temperatures |
| url | https://www.mdpi.com/2075-4701/11/7/1145 |
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