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

0519299 - ÚFP 2023 RIV KR eng J - Journal Article
Vlach, M. - Čízek, J. - Kodetová, V. - Kekule, T. - Lukáč, František - Cieslar, M. - Kudrnová, H. - Bajtošová, L. - Leibner, M. - Harcuba, P. - Málek, J. - Neubert, V.
Annealing Effects in Cast Commercial Aluminium Al-Mg-Zn-Cu(-Sc-Zr) Alloys.
Metals and Materials International. Roč. 25, May (2021), s. 995-1004. ISSN 1598-9623. E-ISSN 2005-4149
Institutional support: RVO:61389021
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
Impact factor: 3.451, year: 2021
Method of publishing: Limited access
https://link.springer.com/article/10.1007%2Fs12540-019-00499-6

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.
Permanent Link: http://hdl.handle.net/11104/0304305