EXPERIMENTAL-DETERMINATION OF LOW-ORDER STRUCTURE FACTORS IN THE INTERMETALLIC COMPOUND TIAL

Rocking curves from several low order reflections in TiAl were recorde d in digitized form using energy-filtered convergent beam electron dif fraction in a transmission electron microscope. The low order reflecti ons studied were 001, 002, 200, 111, 110, 220, 202, 113 and 311. These experimental rocking curves were simulated using computations based o n the dynamic theory of electron diffraction. From these simulations, values of the X-ray structure factors for these reflections were deduc ed, and then used to determine charge difference maps for varioius pla ne sections in TiAl. These charge difference maps were compared with t heoretical predictions, and it was found that there is a considerable degree of agreement between theory and experiment.