On the one of the practical scientific utilisations of low power research reactor LVR-15 in Řež

0517291 - ÚJF 2020 RIV BE eng C - Conference Paper (international conference)
Mikula, Pavol - Stammers, James H. - Rogante, M. - Michalcová, A.
On the one of the practical scientific utilisations of low power research reactor LVR-15 in Řež.
European Research Reactor Conference (RRFM 2019). Brussel: European Nuclear Society, 2019, č. článku A0015. ISBN 978-92-95064-31-7.
[European Research Reactor Conference 2019 (RRFM 2019). Jordan Valley (JO), 24.03.2019-28.03.2019]
R&D Projects: GA MŠMT LM2015056; GA ČR GC16-08803J
Institutional support: RVO:61389005
Keywords : neutron powder diffraction method * bent perfect crystal * neutron diffraction
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)

In our contribution we will focus our attention on the scientific utilisation of one of the beam tubes for plastic deformation studies of metallic polycrystalline samples by a newly developed high-resolution neutron powder diffraction method. The method consists of unconventional triple axis set up employing bent perfect crystal (BPC) monochromator and analyser with a polycrystalline sample in between. After the realisation of focusing conditions in real and momentum space at the
neutron wavelength of 0.162 nm, a high angular resolution down up to FWHM(Dd/d)=2x10-3 was achieved on the standard alpha-Fe(110) sample (2 mm diameter) which then opened the possibility for measurements of small lattice
parameter changes of samples, namely, as a result of a thermomechanical load. The feasibility of the instrument for macro- and microstrain as well as grain size studies is demonstrated on the low carbon shear deformed steel wires and the
powder samples of FeAl plastically deformed by ball milling.
Permanent Link: http://hdl.handle.net/11104/0302602