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Open AccessArticle

Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy

1
Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
2
Nuclear Physics Institute, The Czech Academy of Sciences, 250 68 Řež, Czech Republic
3
MagIC—Magnesium Innovation Centre, Helmholtz-Zentrum Geesthacht, Max-Planck Str. 1, D21502 Geesthacht, Germany
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 351; https://doi.org/10.3390/ma13020351
Received: 17 December 2019 / Revised: 4 January 2020 / Accepted: 9 January 2020 / Published: 12 January 2020
(This article belongs to the Section Structure Analysis and Characterization)
The impact of precompression, thermal treatment and its combination on the deformation behaviour of an extruded Mg–Zn–Ca (ZX10) alloy was studied with respect to a varied average grain size. The Hall–Petch plot was used to highlight the impact in a wide grain size interval. The initial texture of the wrought alloy was characterized by X-ray diffraction. Moreover, the evolution of microstructure and texture was provided by the electron backscatter diffraction (EBSD) technique. The obtained results indicate the strong contribution of deformation-thermal treatment on the resulting deformation behaviour. Particularly, after precompression and heat treatment, higher strengthening effect was observed in the reversed tensile loaded compared to compressed samples without any change in the Hall–Petch slope throughout the grain size interval. Unlike this strengthening effect, a reversed tension–compression yield asymmetry with higher strength values in compression has been obtained. View Full-Text
Keywords: Mg alloy; deformation-thermal treatment; yield asymmetry; Hall–Petch relationship Mg alloy; deformation-thermal treatment; yield asymmetry; Hall–Petch relationship
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MDPI and ACS Style

Dobroň, P.; Drozdenko, D.; Horváth Fekete, K.; Olejňák, J.; Bohlen, J. Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy. Materials 2020, 13, 351.

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