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Annealing Effects in Cast Commercial Aluminium Al-Mg-Zn-Cu(-Sc-Zr) Alloys
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SYSNO ASEP 0519299 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Annealing Effects in Cast Commercial Aluminium Al-Mg-Zn-Cu(-Sc-Zr) Alloys Author(s) Vlach, M. (CZ)
Čízek, J. (CZ)
Kodetová, V. (CZ)
Kekule, T. (CZ)
Lukáč, František (UFP-V) ORCID
Cieslar, M. (CZ)
Kudrnová, H. (CZ)
Bajtošová, L. (CZ)
Leibner, M. (CZ)
Harcuba, P. (CZ)
Málek, J. (CZ)
Neubert, V. (CZ)Number of authors 12 Source Title Metals and Materials International. - : Korean Institute of Metals and Materials - ISSN 1598-9623
Roč. 25, May (2021), s. 995-1004Number of pages 12 s. Language eng - English Country KR - Korea, Republic of Keywords al-mg alloy ; mechanical-properties ; microstructure evolution ; precipitation processes ; aging behavior ; high-level ; zr alloy ; sc ; cu ; particles ; 7xxx series ; Clusters ; tem ; Positron annihilation ; Al-3(Sc,Zr) particles ; Activation energy OECD category Materials engineering Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000491937400001 EID SCOPUS 85074261087 DOI 10.1007/s12540-019-00499-6 Annotation Precipitation reactions of the cast Al-3.4 at%Mg-2.7 at%Zn-0.80 at%Cu-0.10 at%Fe-0.05 at%Si alloy with and without addition of 0.14 at%Sc and 0.06 at%Zr were characterized by electrical resistometry, electron microscopy, X-ray diffraction, thermal analysis, microhardness testing, and positron annihilation. The AlMgZnCuScZr alloy contains a grain boundary T-phase (Mg-32(Al,Cu,Zn)(49)) with a cubic and/or quasicrystalline structure. The AlMgZnCu alloy contains a mixture of MgZn2- and the T-phase. Primary multilayer Al-3(Sc,Zr) particles precipitated during casting and subsequent cooling. The particles have a layered Al-3(Sc,Zr) + alpha-Al + Al-3(Sc,Zr) structure, i.e. consist of regions enriched with both Sc and Zr. Small atomic Mg,Zn(,Cu)-rich clusters coherent with the matrix were formed during the cooling of both alloys and/or in the course of their storage at ambient temperature. Their dissolution enables precipitation of the transient eta '- and/or stable eta-phases of the AlZnMgCu system in both investigated alloys. The effective activation energy for the dissolution of the clusters was calculated as similar to 103 kJ/mol. Annealing of the AlMgZnCuScZr alloy above 300 degrees C leads to a formation of the secondary Al-3(Sc,Zr) particles which cause precipitation hardening and guarantee thermal stability of mechanical properties. Addition of Sc and Zr micro alloying elements resulted in a substantial grain refinement. The grain size remains unchanged up to isochronal annealing at 390 degrees C. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2023 Electronic address https://link.springer.com/article/10.1007%2Fs12540-019-00499-6
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