Annealing Effects in Cast Commercial Aluminium Al–Mg–Zn–Cu(–Sc–Zr) Alloys

Martin Vlach; Jakub Čížek; Veronika Kodetová; Tomáš Kekule; František Lukáč; Miroslav Cieslar; Hana Kudrnová; Lucia Bajtošová; Michal Leibner; Petr Harcuba; Jaroslav Málek; Volkmar Neubert

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자료유형: 학술저널

저자정보: Martin Vlach (Charles University) Jakub Čížek (Charles University) Veronika Kodetová (Charles University) Tomáš Kekule (Charles University) František Lukáč (Charles University) Miroslav Cieslar (Charles University) Hana Kudrnová (Charles University) Lucia Bajtošová (Charles University) Michal Leibner (Charles University) Petr Harcuba (Charles University) Jaroslav Málek (Czech Technical University in Prague) Volkmar Neubert (Institut für Materialprüfung und Werkstofftechnik)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.5

발행연도: 2021.1

수록면: 995 - 1,004 (10page)

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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 withoutaddition 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 boundaryT-phase (Mg32(Al,Cu,Zn)49) with a cubic and/or quasicrystalline structure. The AlMgZnCu alloy contains a mixture ofMgZn2-and the T-phase. Primary multilayer Al3(Sc,Zr) particles precipitated during casting and subsequent cooling. Theparticles have a layered Al3(Sc,Zr) + α-Al + Al3(Sc,Zr) structure, i.e. consist of regions enriched with both Sc and Zr. Smallatomic Mg,Zn(,Cu)-rich clusters coherent with the matrix were formed during the cooling of both alloys and/or in the courseof their storage at ambient temperature. Their dissolution enables precipitation of the transient η′- and/or stable η-phasesof the AlZnMgCu system in both investigated alloys. The effective activation energy for the dissolution of the clusters wascalculated as ~ 103 kJ/mol. Annealing of the AlMgZnCuScZr alloy above 300 °C leads to a formation of the secondaryAl3(Sc,Zr) particles which cause precipitation hardening and guarantee thermal stability of mechanical properties. Additionof Sc and Zr micro alloying elements resulted in a substantial grain refinement. The grain size remains unchanged upto isochronal annealing at 390 °C.

#7xxx series · Clusters · TEM · Positron annihilation · Al3(Sc #Zr) particles · Activation energy

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