Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases
Precipitation behavior in an industrially extruded AA7003 alloy has been studied using Transmission Electron Microscopy (TEM) together with Differential Scanning Calorimetry (DSC). Air Cooling (AC) after solution heat treatment results in quench induced heterogeneous precipitation of both β-Mg2Si an...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-01-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127519306422 |
| _version_ | 1819017164680593408 |
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| author | A. Lervik C.D. Marioara M. Kadanik J.C. Walmsley B. Milkereit R. Holmestad |
| author_facet | A. Lervik C.D. Marioara M. Kadanik J.C. Walmsley B. Milkereit R. Holmestad |
| author_sort | A. Lervik |
| collection | DOAJ |
| description | Precipitation behavior in an industrially extruded AA7003 alloy has been studied using Transmission Electron Microscopy (TEM) together with Differential Scanning Calorimetry (DSC). Air Cooling (AC) after solution heat treatment results in quench induced heterogeneous precipitation of both β-Mg2Si and η-MgZn2 phases. Detailed TEM characterisation of resulting nanoscale precipitates after AC, or Water Quenching (WQ), and subsequent artificial ageing demonstrate that η′ and η2 hardening precipitates dominate in T6, whereas the overaged T7 state contains η2 and η1, where the latter accounts for approximately 50% of the relative phase fraction. The T7 state in addition forms 6xxx-type hardening precipitates only after WQ. Results presented here are expected to be relevant for any Si containing 7xxx alloy and open new possibilities for development of hybrid 6xxx- and 7xxx series aluminium alloys. This is discussed with respect to potential influence on mechanical- and corrosion properties. Keywords: Aluminium alloys, Scanning transmission electron microscopy, Heterogeneous nucleation, Differential scanning calorimetry, η-MgZn2, Precipitation |
| first_indexed | 2024-12-21T02:59:11Z |
| format | Article |
| id | doaj.art-b67da5c7e8b641e1848089b98032fd75 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-21T02:59:11Z |
| publishDate | 2020-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-b67da5c7e8b641e1848089b98032fd752022-12-21T19:18:15ZengElsevierMaterials & Design0264-12752020-01-01186Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phasesA. Lervik0C.D. Marioara1M. Kadanik2J.C. Walmsley3B. Milkereit4R. Holmestad5Department of Physics, Norwegian University of Science and Technology (NTNU), Trondheim N-7491, Norway; Corresponding author.SINTEF Industry, N-7465 Trondheim, NorwayDepartment of Materials Science and Metallurgy, University of Cambridge, CB2 3QZ, UK; Competence Centre °CALOR, Department Life, Light & Matter, Faculty of Interdisciplinary Research, University of Rostock, Albert-Einstein-Str. 25, Rostock 18059, GermanyChair of Materials Science, Faculty of Marine Technology and Mechanical Engineering, University of Rostock, Albert-Einstein-Str. 2, Rostock 18059, GermanyDepartment of Materials Science and Metallurgy, University of Cambridge, CB2 3QZ, UK; Competence Centre °CALOR, Department Life, Light & Matter, Faculty of Interdisciplinary Research, University of Rostock, Albert-Einstein-Str. 25, Rostock 18059, GermanyDepartment of Physics, Norwegian University of Science and Technology (NTNU), Trondheim N-7491, NorwayPrecipitation behavior in an industrially extruded AA7003 alloy has been studied using Transmission Electron Microscopy (TEM) together with Differential Scanning Calorimetry (DSC). Air Cooling (AC) after solution heat treatment results in quench induced heterogeneous precipitation of both β-Mg2Si and η-MgZn2 phases. Detailed TEM characterisation of resulting nanoscale precipitates after AC, or Water Quenching (WQ), and subsequent artificial ageing demonstrate that η′ and η2 hardening precipitates dominate in T6, whereas the overaged T7 state contains η2 and η1, where the latter accounts for approximately 50% of the relative phase fraction. The T7 state in addition forms 6xxx-type hardening precipitates only after WQ. Results presented here are expected to be relevant for any Si containing 7xxx alloy and open new possibilities for development of hybrid 6xxx- and 7xxx series aluminium alloys. This is discussed with respect to potential influence on mechanical- and corrosion properties. Keywords: Aluminium alloys, Scanning transmission electron microscopy, Heterogeneous nucleation, Differential scanning calorimetry, η-MgZn2, Precipitationhttp://www.sciencedirect.com/science/article/pii/S0264127519306422 |
| spellingShingle | A. Lervik C.D. Marioara M. Kadanik J.C. Walmsley B. Milkereit R. Holmestad Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases Materials & Design |
| title | Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases |
| title_full | Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases |
| title_fullStr | Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases |
| title_full_unstemmed | Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases |
| title_short | Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases |
| title_sort | precipitation in an extruded aa7003 aluminium alloy observations of 6xxx type hardening phases |
| url | http://www.sciencedirect.com/science/article/pii/S0264127519306422 |
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