The effect of pre-deformation on grain boundary non-equilibrium segregation during recrystallization in f.c.c alloy

By means of the particle tracking autoradiography (PTA) technique, optical and electron microscopy, the non-equilibrium segregation of boron at moving boundary during recrystallization in Fe-30%Ni alloy was investigated. The influence of pre-deformation on the segregation was analysed. The results indicated that there was a abnormal boron segregation at the moving boundaries of the new grain during recrystallization. Its intensity was depended on the pre-deformation degree and the moving speed of the boundary. The TEM result showed that the dislocation density in front of moving boundary obviously increase. The phenomena are discussed in terms of the widening grain boundary mechanism.