DYNAMIC RECRYSTALLIZATION BEHAVIOUR OF TWIN ROLL CAST ZAX210 STRIPS DURING HOT DEFORMATION

1 KITTNER Kristina
Co-authors:
1 ullmann Madlen 1 Henseler Thorsten 1 Prahl Ulrich 1 Kawalla Rudolf
Institution:
1 Technische Universität Bergakademie Freiberg, Institute of Metal Forming, Freiberg, Germany, EU, Madlen.Ullmann@imf.tu-freiberg.de
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1528-1534
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
27 views / 16 downloads
Abstract

The recrystallization behaviour of a twin roll cast ZAX210 alloy has been investigated under deformation conditions equivalent to the hot rolling process of magnesium strip. A set of strain levels, beginning at the critical strain for the onset of dynamic recrystallization has been studied. The dynamic recrystallization taking place during hot deformation of the magnesium alloy ZAX210 was analysed by plane strain compression tests together with optical microstructure investigation. The volume fraction and size of dynamically recrystallized grains increased with increasing strain. With equal strain the dynamically recrystallized volume fraction rises with higher deformation temperatures as well as lower strain rates. Furthermore, it has been found that the deformation temperature plays a major role, rather than the strain rates, in the activation of dynamic recrystallization processes during deformation. The results were used to identify the coefficients for the JMAK-model approach on the dynamic recrystallization of the ZAX210 twin roll cast strip.

Keywords: Dynamic recrystallization, magnesium alloy, calcium, Mg-Zn-Al-Ca alloy, twin roll casting, plain strain compression test
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