THE FEATURES OF THE NANOCRYSTALLINE STRUCTURE IN GERMANIUM SUBJECT TOSEVERE PLASTIC-DEFORMATION

The features of the nanocrystalline (NC) structure in germanium subjec t to severe plastic deformation (SPD) are examined in this paper. Tran smission electron microscopy (TEM), X-ray analysis and differential sc anning calorimetry (DSC) were employed in the structural study of germ anium specimens. After annealing at 850 degrees C the crystallites in the NC state have non-equilibrium grain boundaries (GB) with a ''sprea d'' diffraction contrast in inclined GB. The dynamical theory of contr ast was used for the analysis of the diffraction GB contrast in NC ger manium. The connection of the ''spread'' contrast with the elastic mic rostrains in NC materials is discussed.