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MAGNESIUM WITH ZR ADDITION PROCESSED BY EQUAL CHANNEL ANGULAR PRESSING

1 ŠAŠEK Stanislav
Co-authors:
1 STRÁSKÁ Jitka 1 MINÁRIK Peter 1 JANEČEK Miloš
Institution:
1 Charles University, Prague, Department of Physics of Materials, Czech Republic, EU, sasekstanislav@seznam.cz
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1753-1758
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
436 views / 224 downloads
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Abstract

Magnesium alloyed with 0.3 wt.% Zr was processed by extrusion followed by equal channel angular pressing (ECAP) for 1, 2, 4 and 8 passes. The material was characterized using microhardness measurements, compression tests and electron backscatter diffraction (EBSD). Coarse microstructure after extrusion was significantly refined. Microstructure after 1 and 2 ECAP passes was bi-modal and become homogeneous with average grain sizes ~2 μm after 4 ECAP passes. Zr addition was found to be critical for retaining refined microstructure. The highest microhardness was measured in the samples after 2 and 4 ECAP passes. Similar evolution was found for yield compression stress measured in normal direction. On the other hand, values of yield strength measured in extrusion direction were saturated in the samples after 2, 4 and 8 ECAP passes. Processing by ECAP led to significant microstructural refinement and substantial increase in strength.

Keywords: Magnesium alloys, ultrafine-grained materials, equal channel angular pressing, electron backscatter diffraction

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