Advanced in-situ experimental techniques for characterization of deformation mechanisms in magnesium alloys

0567263 - ÚJF 2024 RIV CH eng J - Journal Article
Dittrich, J. - Farkas, Gergely - Drozdenko, D. - Knapek, M. - Máthis, K. - Minárik, P.
Advanced in-situ experimental techniques for characterization of deformation mechanisms in magnesium alloys.
Journal of Alloys and Compounds. Roč. 937, MAR (2023), č. článku 168388. ISSN 0925-8388. E-ISSN 1873-4669
R&D Projects: GA MŠMT LM2018111
Institutional support: RVO:61389005
Keywords : Magnesium alloys * texture * twinning * acoustic emission * neutron diffraction * in-situ EBSD
OECD category: Materials engineering
Impact factor: 6.2, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.jallcom.2022.168388

A combination of advanced in-situ experimental techniques, comprised of neutron diffraction, acoustic emission (AE), and in-situ electron backscattered diffraction (EBSD) was selected to provide extensive in-sight into the deformation behavior of magnesium alloys based on their mutual complementarity. The potential and limitations of these techniques were shown and discussed in the scope of the study of the influence of the crystallographic texture influence on the activity of individual deformation mechanisms in a hot-rolled sheet of the AZ31 magnesium alloy. The neutron diffraction experiments coupled with a re-cording of the AE signal allowed monitoring of the twinning activity and the evolution of its dynamics from nucleation toward twin growth. The AE suggested microplastic behavior, which was confirmed by the lattice strain evolution analysis for the sample compressed in the sheet normal direction. The in-situ EBSD experiments provided direct observation of the deformed microstructure, including the formation of twinning bands and the transition from twin nucleation to growth with progressing strain, being in very good agreement with the indirect neutron diffraction and AE measurements. Furthermore, the subsequent analysis of the EBSD maps enabled the quantification of the twinned volume fraction and its qualitative comparison with the evolution measured by neutron diffraction. The EBSD-based slip trace analysis re-vealed a notable non-Schmid basal activity and offered insight into the mechanisms accommodating strain once the twinning was exhausted.
Permanent Link: https://hdl.handle.net/11104/0338534