Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains
This study aims to achieve an ultrafine-grained (UFG) Al 2024 alloy superplasticity at temperatures lower than the traditional ones for commercial Al alloys (400–500 °C). The UFG structure with a mean grain size of 100 nm produced in the alloy by high-pressure torsion at room temperature provided a...
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/2/727 |
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| author | Elena V. Bobruk Maxim Yu. Murashkin Ilnar A. Ramazanov Vil U. Kazykhanov Ruslan Z. Valiev |
| author_facet | Elena V. Bobruk Maxim Yu. Murashkin Ilnar A. Ramazanov Vil U. Kazykhanov Ruslan Z. Valiev |
| author_sort | Elena V. Bobruk |
| collection | DOAJ |
| description | This study aims to achieve an ultrafine-grained (UFG) Al 2024 alloy superplasticity at temperatures lower than the traditional ones for commercial Al alloys (400–500 °C). The UFG structure with a mean grain size of 100 nm produced in the alloy by high-pressure torsion at room temperature provided a very high strength—microhardness (HV<sub>0.1</sub>) of 286 ± 4, offset yield strength (σ<sub>0.2</sub>) of 828 ± 9 MPa, and ultimate tensile strength (σ<sub>UTS</sub>) of 871 ± 6 MPa at elongation to failure (δ) of 7 ± 0.2%. Complex tensile tests were performed at temperatures from 190 to 270 °C and strain rates from 10<sup>−2</sup> to 5 × 10<sup>−5</sup> s<sup>−1</sup>, and the values of flow stress, total elongation and strain rate-sensitivity coefficient were determined. The UFG alloy was shown to exhibit superplastic behavior at test temperatures of 240 and 270 °C. For the first time, 400% elongation was achieved in the alloy at an unusually low temperature of 270 °C (0.56 T<sub>m</sub>) and strain rate of 10<sup>−3</sup> s<sup>−1</sup>. The UFG 2024 alloy after superplastic deformation was found to have higher strength (150–160 HV) than that after the standard strengthening heat treatment T6. |
| first_indexed | 2024-03-09T11:49:18Z |
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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:49:18Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-3d8f6a3adf6e44b08d0b95e7fa1bf7fb2023-11-30T23:17:20ZengMDPI AGMaterials1996-19442023-01-0116272710.3390/ma16020727Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine GrainsElena V. Bobruk0Maxim Yu. Murashkin1Ilnar A. Ramazanov2Vil U. Kazykhanov3Ruslan Z. Valiev4Institute of Physics of Advanced Materials, Ufa University of Science and Technology, 32 Zaki Validi Str., Ufa 450076, RussiaInstitute of Physics of Advanced Materials, Ufa University of Science and Technology, 32 Zaki Validi Str., Ufa 450076, RussiaInstitute of Physics of Advanced Materials, Ufa University of Science and Technology, 32 Zaki Validi Str., Ufa 450076, RussiaInstitute of Physics of Advanced Materials, Ufa University of Science and Technology, 32 Zaki Validi Str., Ufa 450076, RussiaInstitute of Physics of Advanced Materials, Ufa University of Science and Technology, 32 Zaki Validi Str., Ufa 450076, RussiaThis study aims to achieve an ultrafine-grained (UFG) Al 2024 alloy superplasticity at temperatures lower than the traditional ones for commercial Al alloys (400–500 °C). The UFG structure with a mean grain size of 100 nm produced in the alloy by high-pressure torsion at room temperature provided a very high strength—microhardness (HV<sub>0.1</sub>) of 286 ± 4, offset yield strength (σ<sub>0.2</sub>) of 828 ± 9 MPa, and ultimate tensile strength (σ<sub>UTS</sub>) of 871 ± 6 MPa at elongation to failure (δ) of 7 ± 0.2%. Complex tensile tests were performed at temperatures from 190 to 270 °C and strain rates from 10<sup>−2</sup> to 5 × 10<sup>−5</sup> s<sup>−1</sup>, and the values of flow stress, total elongation and strain rate-sensitivity coefficient were determined. The UFG alloy was shown to exhibit superplastic behavior at test temperatures of 240 and 270 °C. For the first time, 400% elongation was achieved in the alloy at an unusually low temperature of 270 °C (0.56 T<sub>m</sub>) and strain rate of 10<sup>−3</sup> s<sup>−1</sup>. The UFG 2024 alloy after superplastic deformation was found to have higher strength (150–160 HV) than that after the standard strengthening heat treatment T6.https://www.mdpi.com/1996-1944/16/2/727superplasticityaluminum alloysultrafine-grained materialsstrength |
| spellingShingle | Elena V. Bobruk Maxim Yu. Murashkin Ilnar A. Ramazanov Vil U. Kazykhanov Ruslan Z. Valiev Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains Materials superplasticity aluminum alloys ultrafine-grained materials strength |
| title | Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains |
| title_full | Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains |
| title_fullStr | Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains |
| title_full_unstemmed | Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains |
| title_short | Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains |
| title_sort | low temperature superplasticity and high strength in the al 2024 alloy with ultrafine grains |
| topic | superplasticity aluminum alloys ultrafine-grained materials strength |
| url | https://www.mdpi.com/1996-1944/16/2/727 |
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