Role of Small Addition of Sc and Zr in Clustering and Precipitation Phenomena Induced in AA7075
A detailed characterization of phase transformations in the heat-treated commercial 7075 aluminum alloys without/with low Sc–Zr addition was carried out. Mechanical and electrical properties, thermal and corrosion behavior were compared to the microstructure development. The eutectic phase consists...
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MDPI AG
2020-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/1/8 |
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| author | Martin Vlach Veronika Kodetova Jakub Cizek Michal Leibner Tomáš Kekule František Lukáč Miroslav Cieslar Lucia Bajtošová Hana Kudrnová Vladimir Sima Sebastian Zikmund Eva Cernoskova Petr Kutalek Volkmar-Dirk Neubert Volkmar Neubert |
| author_facet | Martin Vlach Veronika Kodetova Jakub Cizek Michal Leibner Tomáš Kekule František Lukáč Miroslav Cieslar Lucia Bajtošová Hana Kudrnová Vladimir Sima Sebastian Zikmund Eva Cernoskova Petr Kutalek Volkmar-Dirk Neubert Volkmar Neubert |
| author_sort | Martin Vlach |
| collection | DOAJ |
| description | A detailed characterization of phase transformations in the heat-treated commercial 7075 aluminum alloys without/with low Sc–Zr addition was carried out. Mechanical and electrical properties, thermal and corrosion behavior were compared to the microstructure development. The eutectic phase consists of four parts: MgZn<sub>2</sub> phase, Al<sub>2</sub>CuMg phase (<i>S</i>-phase), Al<sub>2</sub>Zn<sub>3</sub>Mg<sub>3</sub> phase (<i>T</i>-phase), and primary <i>λ</i>-Al(Mn,Fe,Si) phase. Strengthening during non-isothermal (isochronal) annealing is caused by a combination of formation of the GP zones, <i>η</i>’-phase, <i>T</i>-phase and co-presence of the primary and secondary Al<sub>3</sub>(Sc,Zr)-phase particles. Positive influence on corrosion properties is owing to the addition of Sc–Zr. Positron annihilation showed an evolution of solute Zn,Mg-(co-)clusters into (precursors of) the GP zones in the course of natural ageing. The concentration of the (co-)clusters is slightly negatively affected by the low Sc–Zr addition. A combination of both precipitation sequences of the Al–Zn–Mg–Cu-based system was observed. The apparent activation energy values for dissolution/formation of the clusters/GP zones and for formation of the metastable <i>η</i>’-phase, stable <i>T</i>-phase and stable <i>η</i>-phase were calculated. |
| first_indexed | 2024-03-10T13:50:16Z |
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| id | doaj.art-531a96a449e3404e868b1cd4f0e831de |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T13:50:16Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-531a96a449e3404e868b1cd4f0e831de2023-11-21T02:10:50ZengMDPI AGMetals2075-47012020-12-01111810.3390/met11010008Role of Small Addition of Sc and Zr in Clustering and Precipitation Phenomena Induced in AA7075Martin Vlach0Veronika Kodetova1Jakub Cizek2Michal Leibner3Tomáš Kekule4František Lukáč5Miroslav Cieslar6Lucia Bajtošová7Hana Kudrnová8Vladimir Sima9Sebastian Zikmund10Eva Cernoskova11Petr Kutalek12Volkmar-Dirk Neubert13Volkmar Neubert14Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-12116 Prague, Czech RepublicJoint Laboratory of Solid State Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 84, CZ-53210 Pardubice, Czech RepublicJoint Laboratory of Solid State Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 84, CZ-53210 Pardubice, Czech RepublicInstitute for Materials Testing and Materials Engineering, Freiberger Strasse 1, D-38678 Clausthal-Zellerfeld, GermanyInstitute for Materials Testing and Materials Engineering, Freiberger Strasse 1, D-38678 Clausthal-Zellerfeld, GermanyA detailed characterization of phase transformations in the heat-treated commercial 7075 aluminum alloys without/with low Sc–Zr addition was carried out. Mechanical and electrical properties, thermal and corrosion behavior were compared to the microstructure development. The eutectic phase consists of four parts: MgZn<sub>2</sub> phase, Al<sub>2</sub>CuMg phase (<i>S</i>-phase), Al<sub>2</sub>Zn<sub>3</sub>Mg<sub>3</sub> phase (<i>T</i>-phase), and primary <i>λ</i>-Al(Mn,Fe,Si) phase. Strengthening during non-isothermal (isochronal) annealing is caused by a combination of formation of the GP zones, <i>η</i>’-phase, <i>T</i>-phase and co-presence of the primary and secondary Al<sub>3</sub>(Sc,Zr)-phase particles. Positive influence on corrosion properties is owing to the addition of Sc–Zr. Positron annihilation showed an evolution of solute Zn,Mg-(co-)clusters into (precursors of) the GP zones in the course of natural ageing. The concentration of the (co-)clusters is slightly negatively affected by the low Sc–Zr addition. A combination of both precipitation sequences of the Al–Zn–Mg–Cu-based system was observed. The apparent activation energy values for dissolution/formation of the clusters/GP zones and for formation of the metastable <i>η</i>’-phase, stable <i>T</i>-phase and stable <i>η</i>-phase were calculated.https://www.mdpi.com/2075-4701/11/1/87xxx aluminum seriesearly precipitation stagescorrosionAl<sub>3</sub>(Sc,Zr) particlesannihilation of positronsactivation energy |
| spellingShingle | Martin Vlach Veronika Kodetova Jakub Cizek Michal Leibner Tomáš Kekule František Lukáč Miroslav Cieslar Lucia Bajtošová Hana Kudrnová Vladimir Sima Sebastian Zikmund Eva Cernoskova Petr Kutalek Volkmar-Dirk Neubert Volkmar Neubert Role of Small Addition of Sc and Zr in Clustering and Precipitation Phenomena Induced in AA7075 Metals 7xxx aluminum series early precipitation stages corrosion Al<sub>3</sub>(Sc,Zr) particles annihilation of positrons activation energy |
| title | Role of Small Addition of Sc and Zr in Clustering and Precipitation Phenomena Induced in AA7075 |
| title_full | Role of Small Addition of Sc and Zr in Clustering and Precipitation Phenomena Induced in AA7075 |
| title_fullStr | Role of Small Addition of Sc and Zr in Clustering and Precipitation Phenomena Induced in AA7075 |
| title_full_unstemmed | Role of Small Addition of Sc and Zr in Clustering and Precipitation Phenomena Induced in AA7075 |
| title_short | Role of Small Addition of Sc and Zr in Clustering and Precipitation Phenomena Induced in AA7075 |
| title_sort | role of small addition of sc and zr in clustering and precipitation phenomena induced in aa7075 |
| topic | 7xxx aluminum series early precipitation stages corrosion Al<sub>3</sub>(Sc,Zr) particles annihilation of positrons activation energy |
| url | https://www.mdpi.com/2075-4701/11/1/8 |
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