On a possible use of neutron three axis diffractometer for studies of elastic and plastic deformation of polycrystalline materials

0517293 - ÚJF 2020 RIV CZ eng C - Conference Paper (international conference)
Mikula, Pavol - Ryukhtin, Vasil - Rogante, M.
On a possible use of neutron three axis diffractometer for studies of elastic and plastic deformation of polycrystalline materials.
EAN 2019 - Conference Proceedings. Praha: Czech Society for Mechanics, 2019, s. 286-290. ISBN 978-802145766-9.
[57th International Scientific Conference on Experimental Stress Analysis (EAN 2019). Luhačovice (CZ), 03.06.2019-06.06.2019]
R&D Projects: GA MŠMT LM2015056
Institutional support: RVO:61389005
Keywords : instrumentation * neutron diffraction * strain measurements
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)

Feasibility of using a high-resolution three axis neutron diffractometer performance for elastic and plastic deformation studies of metallic polycrystalline samples is presented. The method consists of unconventional set up employing bent perfect crystal (BPC) monochromator and analyzer with a polycrystalline sample in between. After the realization of focusing conditions in real and momentum space at the neutron wavelength of 0.162 nm, a high angular resolution up to FWHM(d/d)=2x10-3 was achieved on the standard Fe(110) sample (2 mm diameter) which then opened the possibility for the measurements of small lattice parameter changes of samples. The feasibility of the instrument for macro-and microstrain as well as grain size studies is demonstrated on the polycrystalline samples of low carbon shear deformed steel wires and the NiTi plates subjected to heat treatment.
Permanent Link: http://hdl.handle.net/11104/0302638