Current state of bulk texture measurement technique using angle dispersive neutron diffraction at RESA

RESA角度分散法中性子回折による集合組織測定技術の現状

徐 平光   ; 諸岡 聡  ; 菖蒲 敬久  ; 鈴木 徹也*

Xu, P. G.; Morooka, Satoshi; Shobu, Takahisa; Suzuki, Tetsuya*

Through close cooperation with many universities and institutes, neutron diffraction texture measurements have already been successfully carried out in Japan at a steady-state reactor neutron source, JRR-3, at a large spallation neutron source, J-PARC, and even at a compact neutron source, RANS. Recently, the JRR-3 nuclear reactor re-started to supply steady-state thermal and cold neutron beams. The Residual Stress Analyzer (RESA) is the only JRR-3 neutron instrument for texture evaluation. Our current tasks involve in refreshing our neutron instrument through several trial neutron measurements and supporting the cooperatively experimental studies in the related research fields. Considering the urgent measurement need from the international cooperative research team on Round Robin Texture Measurement using Neutron Diffraction, we carried out the texture measurement of the experimentally deformed limestone standard sample (K433). The incident neutron wavelength is 2.00 angstrom and the beam size is 20mm 20mm to fully bath the limestone sample. Different with the conventional individual peak fitting for each pole figure orientation, here, all the measured diffraction patterns were analyzed using the MAUD Rietveld texture analysis software. Through comparing the experimental and recalculated (006) pole figures of the calcite phase (CaCO with a low rhombohedral crystal symmetry) from RESA with the corresponding published pole figures using angle dispersive neutron diffraction, we have confirmed that the current technical environment for texture measurement at RESA is reliable to evaluate the bulk texture of a complex polycrystalline material.