The recrystallization and grain growth of boron-free and boron-doped (500ppm[wt]) Ni3Al polycrystals were investigated at 700 to 1000C. The levels of deformation were 17% reduction in length in compression for both alloys and 40% rolling reduction applied only to the boron-doped alloy. For alloys with or without boron, the Kolmogorov-Johnson-Mehl-Avrami relationship held, with the Avrami exponent near to unity, and the recrystallization rate was very slow. The activation energies for recrystallization were respectively 480 and 492kJ/mol for boron-free and up to 40% boron-doped. The grain growth kinetics obeyed a power law with the time exponent ranging from 0·2 to 0·4. The boron effect at 500ppm was found to be small for both recrystallization and grain growth in Ni3Al.

Recrystallization and Grain Growth in Ni3Al with and without Boron. Zhou, B., Chou, Y.T., Liu, C.T.: Intermetallics, 1993, 1[4], 217-25