The nanophase Fe73.5CU1Nb3Si13.5B9 alloy obtained by nanocrystallization fr
om the amorphous state was studied. The investigation of the deformation of
the nanophase alloy having an average grain size of 10 nm by active stretc
hing in the column of an electron microscope showed that the deformation oc
curred by the rotation of nanograins and their adjustment to an orientation
that is closest for a number of nanograins oriented in the direction of ma
ximum shear stresses relative to the stretching axis and subsequent sliding
of nanograin groups in this direction ("effect of load transportation on p
arallel rollers"). In the process of sliding, interaction between defects o
ccurs in the boundaries and near-boundary regions. Deformation develops thr
ough "spilling" and formation of new "parallel rollers" up to the complete
failure of a specimen, which occurs because of the strong localization of d
eformation.