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MICROSTRUCTURE EVOLUTION AND CORROSION RESISTANCE OF MAGNESIUM ALLOYS WN43 PROCESSED BY ECAP

1 ZEMKOVÁ Mária
Co-authors:
1 KRÁL Robert 2 BOHLEN Jan 1 MINÁRIK Peter
Institutions:
1 Department of Physics of Materials, Charles University, Praha, Czech Republic, EU
2 Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH, Geesthacht, Germany, EU
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1590-1594
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
429 views / 202 downloads
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Abstract

This report shows first investigation of microstructure development and its effect on mechanical strength and corrosion resistance of non-commercial magnesium alloy WN43 processed extrusion (Ex) and equal-channel angular pressing (ECAP). Bimodal grain size distribution with high volume fraction of ultra-fine grains about 650 nm in diameter was achieved after 4 passes through ECAP. The microhardness measurement showed substantial increase of mechanical strength; however, initial corrosion attack investigated by linear polarization method was found to be more severe in the ECAPed condition. Deterioration of the initial corrosion resistance was attributed to high volume fraction of the grain boundaries and other lattice defects.

Keywords: WN43 alloy, ECAP, ultra-fine-grain microstructure, corrosion

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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