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On the Resolution in Strain/Stress Measurements on Bulk Polycrystalline Samples by 3-Axis Neutron Diffractometer

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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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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Authors and Affiliations

  1. Nuclear Physics Institute ASCR, v.v.i., 25068, Řež, Czech Republic

    P. Mikula & V. Ryukhtin

  2. University of Chemistry and Technology, 16628, Prague 6, Czech Republic

    A. Michalcová

  3. National Research Centre “Kurchatov Institute”, 123182, Моscow, Russia

    V. T. Em

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  1. P. Mikula
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  2. V. Ryukhtin
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  3. A. Michalcová
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  4. V. T. Em
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Correspondence to P. Mikula.

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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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