The mobility of grain boundary dislocations in pure stoichiometric Ni3Al and in Ni3Al containing 700ppm of boron was determined by transmission electron microscopic measurements of the spreading kinetics of trapped lattice dislocations. It was shown that introduction of boron to Ni3Al changed the properties of grain boundaries, which resulted in substantial decreases in grain boundary dislocation mobility.

Boron Influence on Grain Boundary Dislocations Mobility in Ni3Al. Świa̧tnicki, W.A., Grabski, M.W.: Acta Metallurgica, 1989, 37[5], 1307-11