Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing
High strength AA7050 aluminum alloy was processed by ECAP through route A in the T7451 condition. Samples were processed at 423 K, with 1 and 3 passes. The resulting microstructure was evaluated by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM)...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2012-10-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000500007 |
| _version_ | 1819206405807144960 |
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| author | Katia Regina Cardoso Dilermando Nagle Travessa Alberto Moreira Jorge Junior Walter José Botta |
| author_facet | Katia Regina Cardoso Dilermando Nagle Travessa Alberto Moreira Jorge Junior Walter José Botta |
| author_sort | Katia Regina Cardoso |
| collection | DOAJ |
| description | High strength AA7050 aluminum alloy was processed by ECAP through route A in the T7451 condition. Samples were processed at 423 K, with 1 and 3 passes. The resulting microstructure was evaluated by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phases were identified by X-ray diffraction (XRD) using monochromatic Cu Kα radiation. Rockwell B hardness and tensile tests were performed for assessment of mechanical properties. The microstructure was refined by the formation of deformation bands, with dislocation cells and elongated subgrains, with an average width of 240 nm, inside these bands. The number of deformation bands increased with the number of passes. A reduction of precipitates size was observed with increase in the number of passes, when compared to initial condition, probably resulting from particle fragmentation during ECAP. After three passes the precipitates tend to a more equiaxed morphology and have sizes smaller than 10 nm. Phases Η' and Η coexist in the microstructure, but Η is the dominant phase, mainly after three passes. The hardness of alloy after the first pass of ECAP is almost equal to the initial condition. After three passes the hardness showed a slight reduction which must be result from recovery process. There was a slight improvement in the yield strength and elongation after one pass, when compared to the initial T7451 condition. The improvement in the ultimate tensile strength was less significant. |
| first_indexed | 2024-12-23T05:07:05Z |
| format | Article |
| id | doaj.art-ff7c816ad2f44623867f6dae12a82b64 |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-12-23T05:07:05Z |
| publishDate | 2012-10-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-ff7c816ad2f44623867f6dae12a82b642022-12-21T17:59:03ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392012-10-01155732738Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular PressingKatia Regina CardosoDilermando Nagle TravessaAlberto Moreira Jorge JuniorWalter José BottaHigh strength AA7050 aluminum alloy was processed by ECAP through route A in the T7451 condition. Samples were processed at 423 K, with 1 and 3 passes. The resulting microstructure was evaluated by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phases were identified by X-ray diffraction (XRD) using monochromatic Cu Kα radiation. Rockwell B hardness and tensile tests were performed for assessment of mechanical properties. The microstructure was refined by the formation of deformation bands, with dislocation cells and elongated subgrains, with an average width of 240 nm, inside these bands. The number of deformation bands increased with the number of passes. A reduction of precipitates size was observed with increase in the number of passes, when compared to initial condition, probably resulting from particle fragmentation during ECAP. After three passes the precipitates tend to a more equiaxed morphology and have sizes smaller than 10 nm. Phases Η' and Η coexist in the microstructure, but Η is the dominant phase, mainly after three passes. The hardness of alloy after the first pass of ECAP is almost equal to the initial condition. After three passes the hardness showed a slight reduction which must be result from recovery process. There was a slight improvement in the yield strength and elongation after one pass, when compared to the initial T7451 condition. The improvement in the ultimate tensile strength was less significant.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000500007severe plastic deformationECAPaluminum alloy |
| spellingShingle | Katia Regina Cardoso Dilermando Nagle Travessa Alberto Moreira Jorge Junior Walter José Botta Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing Materials Research severe plastic deformation ECAP aluminum alloy |
| title | Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing |
| title_full | Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing |
| title_fullStr | Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing |
| title_full_unstemmed | Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing |
| title_short | Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing |
| title_sort | microstructure evolution of aa7050 al alloy during equal channel angular pressing |
| topic | severe plastic deformation ECAP aluminum alloy |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000500007 |
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