High-Resolution Three-Axis Neutron Diffractometer for Microstructure Investigations of Polycrystalline Materials

0572671 - ÚJF 2024 RIV NL eng C - Conference Paper (international conference)
Mikula, Pavol - Ryukhtin, Vasil
High-Resolution Three-Axis Neutron Diffractometer for Microstructure Investigations of Polycrystalline Materials.
Procedia Structural Integrity. Vol. 43. Amsterdam: Elsevier B. V., 2023 - (Pokluda, J.; Šandera, P.), s. 119-123. ISSN 2452-3216.
[MSMF10 - International Conference on Materials Structure and Micromechanics of Fracture /10./. Brno (CZ), 12.09.2022-14.09.2022]
R&D Projects: GA MŠMT LM2023057
Research Infrastructure: CICRR - 90241
Institutional support: RVO:61389005
Keywords : Bragg diffraction optics * microstructure analysis * Neutron diffraction * polycystalline materials
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Method of publishing: Open access
https://doi.org/10.1016/j.prostr.2022.12.245

Recently, focusing 3-axis diffractometer set-up equipped with the bent perfect crystal (BPC) monochromator and analyzer which has offered the sensitivity in determination of strains Δd/d < 10-4in polycrystalline materials, has been introduced. The resolution determined by FWHM of the diffraction profiles is about one order of magnitude higher with respect to that of conventional 2-axis neutron strain/stress scanners. Therefore, the new set-up also offers possibility of line profile analysis for relatively large irradiated gauge volumes and reasonable counting times, because the 3-axis set-up exploits focusing in real and momentum space simultaneously. As it is demonstrated on several samples, the 3-axis diffractometer can be successfully used in the strain/stress measurements on samples exposed to an external load, studies of diffraction profile affected by plastic deformation, determination of phases having very close values of the lattice spacings etc. The analysis is carried out by rocking the BPC analyzer and the neutron signal is registered by a point detector.
Permanent Link: https://hdl.handle.net/11104/0343278