SMALL-ANGLE NEUTRON-SCATTERING OF PRECIPITATES IN NI-RICH NI-TI ALLOYS - II - METHODS FOR ANALYZING ANISOTROPIC SCATTERING DATA

Methods for analyzing small-angle neutron scattering data for single c rystals with anisometric precipitates and anisotropic arrangement are described. A method for projecting the measured scattering intensity i n a (110) plane and obtaining the anisotropic correlation function is described. The method uses an indirect Fourier transformation with Her mitian functions as the basis. The correlation function gives model-in dependent information on the precipitate form and arrangement. A modif ied paracrystal cluster model is also introduced and size polydispersi ty is included in a local monodisperse approximation. The size distrib ution is obtained by least-squares fitting. The correlation function a nd the cluster model give consistent results for the morphology of pre cipitates in Ni-rich Ni-Ti single crystals.