The effect of Zr on dynamic recrystallization during ECAP processing of Mg-Y-RE alloys

0542560 - ÚJF 2022 RIV US eng J - Journal Article
Minárik, P. - Zemková, M. - Veselý, J. - Bohlen, J. - Knapek, Michal - Král, R.
The effect of Zr on dynamic recrystallization during ECAP processing of Mg-Y-RE alloys.
Materials Characterization. Roč. 174, APR (2021), č. článku 111033. ISSN 1044-5803. E-ISSN 1873-4189
R&D Projects: GA MŠMT EF16_013/0001794
Institutional support: RVO:61389005
Keywords : magnesium * rare earth elements * ECAP
OECD category: Materials engineering
Impact factor: 4.537, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.matchar.2021.111033

Two magnesium alloys containing yttrium and rare-earth elements were processed by equal channel angular pressing (ECAP) to explore the effect of the small addition of zirconium on the resulting microstructures. The composition of the alloys was Mg?3.8wt%Y?2.6 wt%RE?0.45 wt%Zr (WE43) and Mg?4.1wt%Y?2.8wt%Nd (WN43), respectively. It is shown that small Zr addition facilitates the formation of small secondary phase particles. The particles become smaller, and their distribution is denser. Consequently, the grain nucleation processes are more active, grain growth is suppressed, and the final grain size is smaller. The faster nucleation rate affects the texture formation during ECAP as well. It is shown that this effect is independent of the initial microstructural condition concerning both the grain size and the presence/distribution of secondary phase particles. The positive impact of Zr was proven employing scanning and transmission electron microscopy, texture measurements by X-ray diffraction and further reflected in the improved strength of the material in terms of microhardness and compression testing. It was shown that, in this way, the microstructure and texture of MgRE alloys could be effectively tailored by small Zr additions.
Permanent Link: http://hdl.handle.net/11104/0319947