Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy
In this paper, the microstructure and mechanical properties of AA7075 with a coarse-fine-grained laminated microstructure produced by spark plasma sintering (SPS) and the cyclic extrusion severe deformation (KOBO) technique were investigated. It was found that an inhomogeneous grain microstructure w...
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MDPI AG
2021-09-01
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| Online Access: | https://www.mdpi.com/2075-4701/11/9/1433 |
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| author | Dariusz Garbiec Volf Leshchynsky Andrea García-Junceda Radosław Swadźba Piotr Siwak Grzegorz Adamek Krzysztof Radwański |
| author_facet | Dariusz Garbiec Volf Leshchynsky Andrea García-Junceda Radosław Swadźba Piotr Siwak Grzegorz Adamek Krzysztof Radwański |
| author_sort | Dariusz Garbiec |
| collection | DOAJ |
| description | In this paper, the microstructure and mechanical properties of AA7075 with a coarse-fine-grained laminated microstructure produced by spark plasma sintering (SPS) and the cyclic extrusion severe deformation (KOBO) technique were investigated. It was found that an inhomogeneous grain microstructure was formed from coarse and fine grains by the SPS process and then was transformed into a coarse-fine-grained laminated microstructure by means of KOBO extrusion at room temperature. The grain refinement during KOBO extrusion resulted in a fine grained laminated microstructure created due to the formation of low-angle grain boundaries (LAGBs), followed by dynamic recrystallization, leading to high-angle grain boundaries (HAGBs). The EBSD analysis results reveal the formation of a deformed and partially recrystallized ultrafine grain microstructure owing to the generation and development of shear bands during KOBO extrusion. The ultimate tensile strength (UTS) of the AA7075 alloy rose after SPS-KOBO severe deformation up to 422 MPa, with high strains of about 33%. The obtained results clearly show that the SPS-KOBO extrusion technique allows a bimodal laminated fine gradient grain microstructure to be obtained due to deformation and dynamic recrystallization, which result in both high strength and good ductility. The new heterogeneous AA7075 alloys obtained by the SPS-KOBO combined techniques demonstrate that microstructural heterogeneities can assist in overcoming the strength–ductility trade-off. |
| first_indexed | 2024-03-10T07:27:07Z |
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| id | doaj.art-831dead8c8a442128db34b99d674030d |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T07:27:07Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-831dead8c8a442128db34b99d674030d2023-11-22T14:13:52ZengMDPI AGMetals2075-47012021-09-01119143310.3390/met11091433Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 AlloyDariusz Garbiec0Volf Leshchynsky1Andrea García-Junceda2Radosław Swadźba3Piotr Siwak4Grzegorz Adamek5Krzysztof Radwański6Łukasiewicz Research Network — Metal Forming Institute, 14 Jana Pawla II St., 61-139 Poznan, PolandŁukasiewicz Research Network — Metal Forming Institute, 14 Jana Pawla II St., 61-139 Poznan, PolandIMDEA Materials Institute, 2 Calle Eric Kandel, 28-906 Getafe, Madrid, SpainŁukasiewicz Research Network — Institute for Ferrous Metallurgy, 12-14 Karola Miarki St., 44-100 Gliwice, PolandFaculty of Mechanical Engineering, Poznan University of Technology, 5 Marii Skłodowskiej-Curie Square, 60-965 Poznan, PolandFaculty of Materials Engineering and Technical Physics, Poznan University of Technology, 5 Marii Skłodowskiej-Curie Square, 60-965 Poznan, PolandŁukasiewicz Research Network — Institute for Ferrous Metallurgy, 12-14 Karola Miarki St., 44-100 Gliwice, PolandIn this paper, the microstructure and mechanical properties of AA7075 with a coarse-fine-grained laminated microstructure produced by spark plasma sintering (SPS) and the cyclic extrusion severe deformation (KOBO) technique were investigated. It was found that an inhomogeneous grain microstructure was formed from coarse and fine grains by the SPS process and then was transformed into a coarse-fine-grained laminated microstructure by means of KOBO extrusion at room temperature. The grain refinement during KOBO extrusion resulted in a fine grained laminated microstructure created due to the formation of low-angle grain boundaries (LAGBs), followed by dynamic recrystallization, leading to high-angle grain boundaries (HAGBs). The EBSD analysis results reveal the formation of a deformed and partially recrystallized ultrafine grain microstructure owing to the generation and development of shear bands during KOBO extrusion. The ultimate tensile strength (UTS) of the AA7075 alloy rose after SPS-KOBO severe deformation up to 422 MPa, with high strains of about 33%. The obtained results clearly show that the SPS-KOBO extrusion technique allows a bimodal laminated fine gradient grain microstructure to be obtained due to deformation and dynamic recrystallization, which result in both high strength and good ductility. The new heterogeneous AA7075 alloys obtained by the SPS-KOBO combined techniques demonstrate that microstructural heterogeneities can assist in overcoming the strength–ductility trade-off.https://www.mdpi.com/2075-4701/11/9/1433spark plasma sinteringKOBO extrusionAA7075microstructuremechanical properties |
| spellingShingle | Dariusz Garbiec Volf Leshchynsky Andrea García-Junceda Radosław Swadźba Piotr Siwak Grzegorz Adamek Krzysztof Radwański Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy Metals spark plasma sintering KOBO extrusion AA7075 microstructure mechanical properties |
| title | Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy |
| title_full | Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy |
| title_fullStr | Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy |
| title_full_unstemmed | Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy |
| title_short | Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy |
| title_sort | microstructure and mechanical properties of spark plasma sintered and severely deformed aa7075 alloy |
| topic | spark plasma sintering KOBO extrusion AA7075 microstructure mechanical properties |
| url | https://www.mdpi.com/2075-4701/11/9/1433 |
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