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A complicated behavior was indicated in nanocrystalline Fe78Si9B13 alloy with grain size lower than 65 nm. No sign of dislocations after deformation has been found in nanocrystalline material, suggesting that it is unlikely that the dislocation pileup is involved. The reduction of the mean hyperfine field is attributed to a decrease in the number of nearest neighbor atoms on the grain boundaries, which may be responsible for the softening behavior in nanocrystalline material with an average crystallite size of 65 nm. An increasing peak of the phonon mode near 900 cm(-1), reflecting strong electron-atom coupling in grain boundary of nanocrystalline material, was observed. (C) 1996 American Institute of Physics.