Abstract :
The deformation tracks distribution in a single
crystal of the high melting FCC-metal iridium, which
exhibits the cleavage after considerable elongation, is
considered. The octahedral slip is the sole deformation
mechanism in iridium single crystal at room temperature,
and, therefore, its mechanical behavior is similar to the
behavior of a FCC-metal. However, in contrast to other
FCC-metals, the resource of plasticity of the iridium single
crystalline samples is exhausted at the initial/early stages of
plastic deformation, when the octahedral slip bands are
homogeneously distributed on the working surface and the
necking is absent in vicinity of the dangerous crack
