Abstract
Important resolution properties of the high-resolution 3-axis neutron diffraction set-up were investigated in the frame of feasibility of its use for strain/stress measurements on bulk polycrystalline samples. The strain analysis was carried out by rocking the BPC-analyzer and the neutron signal registered by a point detector. The so-called rocking curve then provided a sample diffraction profile and could reflect the lattice or structural changes. In comparison with a conventional 2-axis set-up, this instrument alternative could be successfully applied, namely, in the strain/stress measurements in bulk samples exposed to an external load, e.g. in tension/compression rig, in aging machine etc. and provide average strain values over a large irradiated volume of the sample.
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ACKNOWLEDGMENTS
Measurements were carried out at the CANAM infrastructure of the NPI CAS Řež. The presented results were also supported by the infrastructural MŠMT project LM2018120 (Experimental nuclear reactors LVR-15 and LR-0). We also thank B. Michalcová for significant help with measurements and basic elaboration of the data.
Funding
P. Mikula acknowledges support from the ESS participation of the Czech Republic—OP (CZ.02.1.01/ 0.0/0.0/16_013/0001794) and J. Šaroun acknowledges support from the project ESS Scandinavia-CZ II (LM2018111). Furthermore, V. Ryukhtin and P. Strunz acknowledge support from the Czech Academy of Sciences in the frame of the program “Strategie AV21, no. 23”.
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Mikula, P., Ryukhtin, V., Michalcová, A. et al. On the Resolution in Strain/Stress Measurements on Bulk Polycrystalline Samples by 3-Axis Neutron Diffractometer. Phys. Metals Metallogr. 123, 1348–1353 (2022). https://doi.org/10.1134/S0031918X21100811
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DOI: https://doi.org/10.1134/S0031918X21100811