On a Possible High-Resolution Residual Strain/Stress Measurements by Three Axis Neutron Diffractometer

摘要

New unconventional high-resolution neutron diffraction three axis set-up for strain/stress measurements of rather large bulk polycrystalline samples is presented. Contrary to the conventional two axis set-ups in this case the strain measurement on the sample situated on the second axis is carried out by rocking the bent perfect crystal (BPC) analyzer situated on the third axis of the diffractometer. The neutron signal is registered by a detector. This new set up provides a considerably higher resolution (～5×) which, however, requires much longer measurement time. Therefore, it can be effectively used, namely, for bulk gauge volumes and/or plastic deformation studies on the basis of analysis of diffraction line profiles.