Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys
The application of light-weight intermetallic materials to address the growing interest and necessity for reduction of CO<sub>2</sub> emissions and environmental concerns has led to intensive research into TiAl-based alloy systems. However, the knowledge about phase relations and transfo...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/12/1991 |
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| author | Benedikt Distl Katja Hauschildt Florian Pyczak Frank Stein |
| author_facet | Benedikt Distl Katja Hauschildt Florian Pyczak Frank Stein |
| author_sort | Benedikt Distl |
| collection | DOAJ |
| description | The application of light-weight intermetallic materials to address the growing interest and necessity for reduction of CO<sub>2</sub> emissions and environmental concerns has led to intensive research into TiAl-based alloy systems. However, the knowledge about phase relations and transformations is still very incomplete. Therefore, the results presented here from systematic thermal analyses of phase transformations in 12 ternary Ti-Al-Nb alloys and one binary Ti-Al measured with 4–5 different heating rates (0.8 to 10 °C/min) give insights in the kinetics of the second-order type reaction of ordered (βTi)<sub>o</sub> to disordered (βTi) as well as the three first-order type transformations from Ti<sub>3</sub>Al to (αTi), ω<sub>o</sub> (Ti<sub>4</sub>NbAl<sub>3</sub>) to (βTi)<sub>o</sub>, and O (Ti<sub>2</sub>NbAl) to (βTi)<sub>o</sub>. The sometimes-strong heating rate dependence of the transformation temperatures is found to vary systematically in dependence on the complexity of the transformations. The dependence on heating rate is nonlinear in all cases and can be well described by a model for solid-solid phase transformations reported in the literature, which allows the determination of the equilibrium transformation temperatures. |
| first_indexed | 2024-03-10T03:34:36Z |
| format | Article |
| id | doaj.art-c815002c480c4829b15bd2e97e1c06cc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:34:36Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-c815002c480c4829b15bd2e97e1c06cc2023-11-23T09:33:56ZengMDPI AGMetals2075-47012021-12-011112199110.3390/met11121991Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb AlloysBenedikt Distl0Katja Hauschildt1Florian Pyczak2Frank Stein3Department Structure and Nano-/Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, GermanyInstitute of Materials Physics, Helmholtz-Zentrum Hereon, 21502 Geesthacht, GermanyInstitute of Materials Physics, Helmholtz-Zentrum Hereon, 21502 Geesthacht, GermanyDepartment Structure and Nano-/Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, GermanyThe application of light-weight intermetallic materials to address the growing interest and necessity for reduction of CO<sub>2</sub> emissions and environmental concerns has led to intensive research into TiAl-based alloy systems. However, the knowledge about phase relations and transformations is still very incomplete. Therefore, the results presented here from systematic thermal analyses of phase transformations in 12 ternary Ti-Al-Nb alloys and one binary Ti-Al measured with 4–5 different heating rates (0.8 to 10 °C/min) give insights in the kinetics of the second-order type reaction of ordered (βTi)<sub>o</sub> to disordered (βTi) as well as the three first-order type transformations from Ti<sub>3</sub>Al to (αTi), ω<sub>o</sub> (Ti<sub>4</sub>NbAl<sub>3</sub>) to (βTi)<sub>o</sub>, and O (Ti<sub>2</sub>NbAl) to (βTi)<sub>o</sub>. The sometimes-strong heating rate dependence of the transformation temperatures is found to vary systematically in dependence on the complexity of the transformations. The dependence on heating rate is nonlinear in all cases and can be well described by a model for solid-solid phase transformations reported in the literature, which allows the determination of the equilibrium transformation temperatures.https://www.mdpi.com/2075-4701/11/12/1991phase transformationdifferential thermal analysisorder-disorderheating rate dependent |
| spellingShingle | Benedikt Distl Katja Hauschildt Florian Pyczak Frank Stein Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys Metals phase transformation differential thermal analysis order-disorder heating rate dependent |
| title | Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys |
| title_full | Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys |
| title_fullStr | Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys |
| title_full_unstemmed | Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys |
| title_short | Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys |
| title_sort | solid solid phase transformations and their kinetics in ti al nb alloys |
| topic | phase transformation differential thermal analysis order-disorder heating rate dependent |
| url | https://www.mdpi.com/2075-4701/11/12/1991 |
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