PSI - Issue 43

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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Procedia Structural Integrity 43 (2023) 119–123

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. © 20 23 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. Abstract Recently, focusing 3-axis diffractometer set-up equipped with the bent perfect crystal (BPC) monochromator an analyz r wh ch has offer the sensitivity in ete mination of strains  d / d < 10 -4 in polycrys alline materials, has been introdu ed. The resolution d te mined by FWHM of the diffracti n profil s i about one rder of magnitude highe with respect to that of conventional 2- xis ne tron strain/ tress scanners. Therefore, the new set-up also offers po sibility of line pro ile analysis for relatively large irradiated gauge vol mes and reasonable counti g times, becau e the 3-axis set-up exploits focu ing in real an momen um pace simultaneously. A it is demon trated on sever l s mples, the 3-axis diffractometer can be succe sfully used n the strain/stress measur ments on samples exposed t an xternal load, studi s of diffraction profile affected plastic deformation, det rmi ation of phase having very close v lues of th lattice spacings etc. The analysis is carried out by rocking the BPC analyzer and the neutron signal is registered by a point detector. © 20 23 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. 10th International Conference on Materials Structure and Micromechanics of Fracture High-Resolution Three-Axis Neutron Diffractometer for Microstructure Investigations of Polycrystalline Materials Pavol Mikula*, Vasyl Ryukhtin Nuclear Physics Institute CAS, 250 68 Řež , Czech Republic Abstract Recently, focusing 3-axis diffractometer set-up equipped with the bent perfect crystal (BPC) monochromator and analyzer which has offered the sensitivity in determination of strains  d / d < 10 -4 in polycrystalline materials, has been introduced. The resolution determined by FWHM of the diffraction profiles is about one order of magnitude higher with respect to that of conventional 2-axis neutron strain/stress scanners. Therefore, the new set-up also offers possibility of line profile analysis for relatively large irradiated gauge volumes and reasonable counting times, because the 3-axis set-up exploits focusing in real and momentum space simultaneously. As it is demonstrated on several samples, the 3-axis diffractometer can be successfully used in the strain/stress measurements on samples exposed to an external load, studies of diffraction profile affected by plastic deformation, determination of phases having very close values of the lattice spacings etc. The analysis is carried out by rocking the BPC analyzer and the neutron signal is registered by a point detector. 10th International Conference on Materials Structure and Micromechanics of Fracture High-Resolution Three-Axis Neutron Diffractometer for Microstructure Investigations of Polycrystalline Materials Pavol Mikula*, Vasyl Ryukhtin Nuclear Physics Institute CAS, 250 68 Řež , Czech Republic

Keywords: Neutron diffraction, Bragg diffraction optics, polycystalline materials, microstructure analysis. Keywords: Neutron diffraction, Bragg diffraction optics, polycystalline materials, microstructure analysis.

* Corresponding author. Tel.: +420-266-173-159; fax: +420-220-940-141. E-mail address: mikula@ujf.cas.cz * Correspon ing author. Tel.: +420-266-173-159; fax: +420-220-940-141. E-mail address: mikula@ujf.cas.cz

2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers.

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.245