Abstract: A new technique for the measurement of B diffusivity in B bearing alloy by particle tracking autoradiography after deboronization has been established with high sensitivity,good reproducibility and fair simplicity.Experimental results show that the Mo addition up to 3% into Ni may accelerate the B diffusion in the range of 900—1250℃ and reduce both the activation energy and the frequency factor of B diffusion but no more influential as the Mo added down to 0.5%.

Key words: diffusion, autoradiongraphy, B, Mo, Ni