High-Resolution Strain/Stress Measurements by Three-Axis Neutron Diffractometer

0538369 - ÚJF 2021 RIV CH eng J - Článek v odborném periodiku
Mikula, Pavol - Ryukhtin, Vasil - Šaroun, Jan - Strunz, Pavel
High-Resolution Strain/Stress Measurements by Three-Axis Neutron Diffractometer.
Materials. Roč. 13, č. 23 (2020), č. článku 5449. E-ISSN 1996-1944
Grant CEP: GA MŠMT LM2015056; GA MŠMT EF16_013/0001794
Grant ostatní: AV ČR(CZ) StrategieAV21/23
Program: StrategieAV
Výzkumná infrastruktura: Reactors LVR-15 and LR-0 II - 90120
Institucionální podpora: RVO:61389005
Klíčová slova: residual stresses * neutron diffraction * three axis setting * high resolution * bent crystal monochromator * bent crystal analyzer
Obor OECD: Nuclear related engineering
Impakt faktor: 3.623, rok: 2020
Způsob publikování: Open access
https://doi.org/10.3390/ma13235449

Resolution properties of the unconventional high-resolution neutron diffraction three-axis setup for strain/stress measurements of large bulk polycrystalline samples are presented. Contrary to the conventional two-axis setups, in this case, the strain measurement on a sample situated on the second axis is carried out by rocking the bent perfect crystal (BPC) analyzer situated on the third axis of the diffractometer. Thus, the so-called rocking curve provides the sample diffraction profile. The neutron signal coming from the analyzer is registered by a point detector. This new setup provides a considerably higher resolution (at least by a factor of 5), which however, requires a much longer measurement time. The high-resolution neutron diffraction setting can be effectively used, namely, for bulk gauge volumes up to several cubic centimeters, and for plastic deformation studies on the basis of the analysis of diffraction line profiles, thus providing average values of microstructure characteristics over the irradiated gauge volume.
Trvalý link: http://hdl.handle.net/11104/0316177