Collaborative advances in bulk texture measurement techniques based on the JAEA large neutron sources and the RIKEN compact neutron source

Xu, P. G.   ; Iwamoto, Chihiro*; Takamura, Masato*; Otake, Yoshie*; Kurihara, Ryo*; Ueno, Kota*; Kataoka, Minami*; Yamamoto, Kazuyoshi ; Harjo, S.   ; Shobu, Takahisa  

Neutron diffraction can collect sample-volume averaged diffraction patterns due to the excellent penetrability and the coarse beam spot, valuable for investigating bulk microstructure changes of polycrystalline materials. In recent years, several neutron instruments in Japan have been employed for precise bulk texture evaluation. The engineering materials diffractometer attached with large sample stage and precise radial collimators at J-PARC has realized a reliably combined Rietveld texture evaluation, simultaneously providing crystallographic textures and other profile-analysis-related material parameters such as crystal structures, stress tensors. The RANS compact neutron source has enabled reliable bulk texture evaluation of steel materials through reasonably using a high stereographic angle resolution and a large sample-gauge volume. As a feed-back from the texture measurement technique based on RANS compact neutron source, recently, weak diffraction patterns step-by-step collected in very short time from RESA neutron diffractometer at JRR-3 have been utilized to realize the precise texture evaluation of various polycrystalline materials, , a standard rock material, and different steel materials.