EVOLUTION OF COMPRESSION STRAIN AND MICROSTRUCTURE OF MG-ND AND MG-Y ALLOYS PROCESSED BY EQUAL CHANNEL ANGULAR PRESSING

1 ZEMKOVÁ Mária
Co-authors:
1 VESELÝ Jozef 1 KRÁL Robert 2 BOHLEN Jan 2 CORRêA Cinthia Antunes 1 MINÁRIK Peter
Institutions:
1 Charles University, Ke Karlovu 5, Prague, Czech Republic, EU, maria.zemkova@mff.cuni.cz
2 Magnesium Innovation Center, Max-Planck-Straße 1, Geesthacht, Germany, EU
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:
1369-1374
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:
14 views / 4 downloads
Abstract

Two binary alloys Mg-3Nd (N3) and Mg-3Y (W3) processed by hot extrusion and equal channel angular pressing (ECAP) were studied. Microstructure after extrusion and a different number of ECAP passes was investigated by scanning and transmission electron microscope. The experimental results showed significant grain refinement in both alloys and massive precipitation in the N3 alloy. Compression deformation tests were conducted in two directions – along with processing direction and transverse direction. A mechanical strength of both alloys was considerably increased (~300%) by ECAP processing due to several factors. Positive effect on the strength had particularly grain boundary hardening, solid solution hardening in the case of W3 and precipitation hardening in the case of N3. Additionally, rather weak texture, which was formed during ECAP in both alloys, resulted in systematically higher strength along the processing direction compared to the transverse direction in almost all samples processed by ECAP.

Keywords: Magnesium alloys, rare earth elements, ECAP, microstructure, mechanical properties
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