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Coexistence of Intermetallic Complexions and Bulk Particles in Grain Boundaries in the ZEK100 Alloy

Boris B. StraumalDepartment of Physical Chemistry, National University of Science and Technology MISiS, Leninskiy Ave. 4, 119049 Moscow, RussiaKristina TsoyOsipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaА. Г. ДружининOsipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaВ. И. ОрловOsipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaN.N. KhrapovaOsipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, RussiaGregory DavdianDepartment of Physical Chemistry, National University of Science and Technology MISiS, Leninskiy Ave. 4, 119049 Moscow, RussiaGregory GersteinInstitute for Material Science, Leibniz Universität Hannover, An der Universität 2, 30823 Garbsen, GermanyA. B. StraumalDepartment of Materials for Agrotechnology, Cotton Breeding, Seed Production and Agrotechnologies Research Institute, University Str. 3, Salar 702147, Uzbekistan

Metalsjournal2023en

ABI

Annotatsiya

Magnesium-based alloys are highly sought after in the industry due to their lightweight and reliable strength. However, the hexagonal crystal structure of magnesium results in the mechanical properties’ anisotropy. This anisotropy is effectively addressed by alloying magnesium with elements like zirconium, zinc, and rare earth metals (REM). The addition of these elements promotes rapid seed formation, yielding small grains with a uniform orientation distribution, thereby reducing anisotropy. Despite these benefits, the formation of intermetallic phases (IP) containing Zn, Zr, and REM within the microstructure can be a concern. Some of these IP phases can be exceedingly hard and brittle, thus weakening the material by providing easy pathways for crack propagation along grain boundaries (GBs). This issue becomes particularly significant if intermetallic phases form continuous layers along the entire GB between two neighboring GB triple junctions, a phenomenon known as complete GB wetting. To mitigate the risks associated with complete GB wetting and prevent the weakening of the alloy’s structure, understanding the potential occurrence of a GB wetting phase transition and how to control continuous GB layers of IP phases becomes crucial. In the investigation of a commercial magnesium alloy, ZEK100, the GB wetting phase transition (i.e., between complete and partial GB wetting) was successfully studied and confirmed. Notably, complete GB wetting was observed at temperatures near the liquidus point of the alloy. However, at lower temperatures, a coexistence of a nano-scaled precipitate film and bulk particles with nonzero contact angles within the same GB was observed. This insight into the wetting transition characteristics holds potential to expand the range of applications for the present alloy in the industry. By understanding and controlling GB wetting phenomena, the alloy’s mechanical properties and structural integrity can be enhanced, paving the way for its wider utilization in various industrial applications.

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Mavzular

Magnesium Alloys: Properties and Applications Aluminum Alloys Composites Properties Corrosion Behavior and Inhibition

Identifikatorlar

DOI: 10.3390/met13081407

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