Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651
Abstract The current study presents the effects of strain and temperature on the mechanical response and microstructure evolution in AA7075-T651 at high strain rates. Compression tests have been performed at room temperature (RT), 200, 300 and 400 °C using a Split-Hopkinson pressure bar (SHPB) setup...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer
2022-09-01
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| Series: | SN Applied Sciences |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s42452-022-05141-6 |
| _version_ | 1817994054546227200 |
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| author | Biswajit Dalai Marie Anna Moretti Paul Åkerström Vladimir A. Esin Lars-Erik Lindgren |
| author_facet | Biswajit Dalai Marie Anna Moretti Paul Åkerström Vladimir A. Esin Lars-Erik Lindgren |
| author_sort | Biswajit Dalai |
| collection | DOAJ |
| description | Abstract The current study presents the effects of strain and temperature on the mechanical response and microstructure evolution in AA7075-T651 at high strain rates. Compression tests have been performed at room temperature (RT), 200, 300 and 400 °C using a Split-Hopkinson pressure bar (SHPB) setup with strain rates ranging between 1400 and 5300 s−1. For deformation at RT, the flow stress increases with increase in strain rate. Whereas deformation at elevated temperatures show a non-monotonous behavior of the flow stress with respect to the strain rate. This trait is attributed to the pronounced effects from the adiabatic shear bands (ASBs); namely, distorted shear bands (DSBs) and transformed shear bands (TSBs); and cracks resulting from the plastic deformation instability during hot deformation. The sequence of microstructure evolution is: inhomogeneity in the initial microstructure – DSB – TSB – crack –fracture. The feasibility of formation and growth of ASBs and cracks increases with increase in strain and temperature, neglecting any significant effect from the strain rate. During the compression tests, temperature of the material rises due to adiabatic heating. Considering a certain strain developed in the material, this adiabatic temperature rise decreases as the deformation temperature is increased. Furthermore, during individual deformation processes, the temperature rise increases with increasing strain. The adiabatic temperature leading to the formation of TSB is approximated to be 0.7 times of the melting temperature of the alloy. These results from the current study are to be used in developing a physics-based material model for the alloy. Article Highlights (i) At elevated temperatures, compression with Split-Hopkinson bars produce two types of shear bands and cracks. (ii) Evolution of shear bands and cracks is promoted by increase in strain and temperature irrespective of strain rate. (iii) Adiabatic temperature approximating to 70% of the melting point forms refined grain structure of transformed band. |
| first_indexed | 2024-04-14T01:47:45Z |
| format | Article |
| id | doaj.art-7f52d7c473ad4fdab4b6691a1c7138cb |
| institution | Directory Open Access Journal |
| issn | 2523-3963 2523-3971 |
| language | English |
| last_indexed | 2024-04-14T01:47:45Z |
| publishDate | 2022-09-01 |
| publisher | Springer |
| record_format | Article |
| series | SN Applied Sciences |
| spelling | doaj.art-7f52d7c473ad4fdab4b6691a1c7138cb2022-12-22T02:19:28ZengSpringerSN Applied Sciences2523-39632523-39712022-09-0141011710.1007/s42452-022-05141-6Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651Biswajit Dalai0Marie Anna Moretti1Paul Åkerström2Vladimir A. Esin3Lars-Erik Lindgren4Department of Engineering Sciences and Mathematics, Luleå University of TechnologyDepartment of Engineering Sciences and Mathematics, Luleå University of TechnologyDepartment of Engineering Sciences and Mathematics, Luleå University of TechnologyCentre Des Matériaux (CNRS UMR 7633), Mines Paris, PSL UniversityDepartment of Engineering Sciences and Mathematics, Luleå University of TechnologyAbstract The current study presents the effects of strain and temperature on the mechanical response and microstructure evolution in AA7075-T651 at high strain rates. Compression tests have been performed at room temperature (RT), 200, 300 and 400 °C using a Split-Hopkinson pressure bar (SHPB) setup with strain rates ranging between 1400 and 5300 s−1. For deformation at RT, the flow stress increases with increase in strain rate. Whereas deformation at elevated temperatures show a non-monotonous behavior of the flow stress with respect to the strain rate. This trait is attributed to the pronounced effects from the adiabatic shear bands (ASBs); namely, distorted shear bands (DSBs) and transformed shear bands (TSBs); and cracks resulting from the plastic deformation instability during hot deformation. The sequence of microstructure evolution is: inhomogeneity in the initial microstructure – DSB – TSB – crack –fracture. The feasibility of formation and growth of ASBs and cracks increases with increase in strain and temperature, neglecting any significant effect from the strain rate. During the compression tests, temperature of the material rises due to adiabatic heating. Considering a certain strain developed in the material, this adiabatic temperature rise decreases as the deformation temperature is increased. Furthermore, during individual deformation processes, the temperature rise increases with increasing strain. The adiabatic temperature leading to the formation of TSB is approximated to be 0.7 times of the melting temperature of the alloy. These results from the current study are to be used in developing a physics-based material model for the alloy. Article Highlights (i) At elevated temperatures, compression with Split-Hopkinson bars produce two types of shear bands and cracks. (ii) Evolution of shear bands and cracks is promoted by increase in strain and temperature irrespective of strain rate. (iii) Adiabatic temperature approximating to 70% of the melting point forms refined grain structure of transformed band.https://doi.org/10.1007/s42452-022-05141-6AA7075-T651Split-Hopkinson pressure barHigh strain rateStress/strain measurementsOptical microscopyAdiabatic shear bands |
| spellingShingle | Biswajit Dalai Marie Anna Moretti Paul Åkerström Vladimir A. Esin Lars-Erik Lindgren Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651 SN Applied Sciences AA7075-T651 Split-Hopkinson pressure bar High strain rate Stress/strain measurements Optical microscopy Adiabatic shear bands |
| title | Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651 |
| title_full | Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651 |
| title_fullStr | Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651 |
| title_full_unstemmed | Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651 |
| title_short | Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651 |
| title_sort | mechanical behavior and microstructure evolution during high strain rate deformation of aa7075 t651 |
| topic | AA7075-T651 Split-Hopkinson pressure bar High strain rate Stress/strain measurements Optical microscopy Adiabatic shear bands |
| url | https://doi.org/10.1007/s42452-022-05141-6 |
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