Growth of recrystallising grains in boron doped Ni76Al24

Cold rolled boron doped Ni76Al24 was partially recrystallised at 850, 875, and 900 degrees C. The recrystallised volume fraction and the interfacial a rea between recrystallised and unrecrystallised parts were determined as fu nctions of time. The analysis of results showed the growth rates of recryst allised grains to be dependent on temperature, but independent of time. The activation energy for the transformation was 168 kJ mol(-1) and that for g rowth was 87 kJ mol(-1). The activation energy for growth was much less tha n that for diffusion and was dependent on the degree of cold working. This has been attributed to the strong interaction of boron with the structural defects produced by cold working. MST/3955.