Evaluation of X-ray Bragg peak profiles with the variance method obtained by in situ measurement on Mg-Al alloys

0523926 - ÚJF 2021 RIV GB eng J - Journal Article
Farkas, Gergely - Groma, I. - Vesely, J. - Máthis, K.
Evaluation of X-ray Bragg peak profiles with the variance method obtained by in situ measurement on Mg-Al alloys.
Journal of Applied Crystallography. Roč. 53, č. 2 (2020), s. 360-368. ISSN 0021-8898. E-ISSN 1600-5767
R&D Projects: GA ČR(CZ) GA18-07140S; GA MŠMT EF16_013/0001794
Institutional support: RVO:61389005
Keywords : X-ray diffraction * variance method * magnesium alloys * dislocation structure * profile analysis
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.304, year: 2020
Method of publishing: Open access
https://doi.org/ 10.1107/S1600576720000709

The microstructural evolution in randomly oriented Mg-Al samples is investigated in situ during compression by X-ray diffraction as a function of Al concentration. The diffraction data are evaluated by the variance method, which provides information about the dislocation density and spatial distribution of the dislocations. The dislocation density increases with increasing alloying content. Since the increment of the dislocation density above the yield point is linear, the mutual dislocation interaction type is determined from the Taylor equation. The results indicate the dominance of basal-basal dislocation interactions, but at higher alloying content the share of the basal-non-basal interactions increases. It is shown that the dynamics of dislocation wall formation also depend on Al content. Transmission electron microscopy observations are in agreement with the results obtained by X-ray line profile analysis.
Permanent Link: http://hdl.handle.net/11104/0308216