Nickel aluminide containing 23.2 at.-%Al and 0.1 at.-%B was cold rolled and
fully recrystallised at 825, 850, 875, 900, 925, 975, and 1000 degrees C.
Increase in grain size as a function of isothermal annealing time at these
temperatures was measured. All the data showed excellent fit with the devel
oped equations. The value of m, the exponent of the grain growth equation (
D-m - D-o(m) = Kt), was 2.5. The activation energy for grain growth was 263
kJ g-atom(-1). Small changes in the boron content had an appreciable effec
t on the kinetic parameters. This was attributed to the solute drag effect
of boron. MST/4129