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HIGH STRAIN RATE SUPERPLASTICITY OF WE43 MAGNESIUM ALLOY

1 VÁVRA Tomáš
Co-authors:
1 KRÁL Robert 2 KUBÁSEK Jiří 1 ZEMKOVÁ Mária 1 MINÁRIK Peter
Institutions:
1 Charles University, Department of Physics of Materials, Prague, Czech Republic, EU, tomvavra1@gmail.com
2 University of Chemistry and Technology, Department of Metals and Corrosion Engineering, Prague, Czech Republic, EU, Jiri.Kubasek@vscht.cz
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:
1297-1301
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2019.760
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
392 views / 238 downloads
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Abstract

Superplastic behavior of ultrafine-grained (UFG) magnesium alloy Mg-4Y-3RE (wt%) prepared by equal channel angular pressing (ECAP) was investigated at high strain rates. Eight passes through ECAP resulted in grain refinement down to ~340 nm and formation of a high volume fraction of fine secondary phase particles located at the grain boundaries and triple-points. Dense distribution and high thermal stability of these particles provided excellent thermal stability of the UFG microstructure even at high temperatures. The microstructure of the material was investigated by transmission electron microscopy. Superplastic behavior was investigated in the temperature range of 350-450 °C and strain rate range of 10-2 s-1 - 10-1 s-1. The results revealed high strain rate superplasticity in the investigated material. Deformation to fracture exceeded 1000% for several deformation conditions, even at the strain rate of 10-1 s-1.

Keywords: Superplasticity, magnesium alloy, equal channel angular pressing

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