The secondary extinction theory of Zachariasen for mosaic crystals as well as the formalism of Becker&Coppens have been used for substructure analysis (lattice disorientations, block size, density of excess dislocations, etc.) in crystals with inhomogeniously distributed dislocations in the Bragg case of diffraction geometry. In the case of large crystals D S >>Λ hkl the mean total density ρ D of randomly distributed dislocations was also estimated taking into account additionally the primary X-ray extinction treatment. In this connection two cases are considered: I) pure secondary extinction related to arrangement of dislocation walls and II) mixed extinction in crystals with large subgrains related to randomly distributed dislocations and arrangement of dislocation walls. In order to check the considerations, the experimental and calculated data were compared for Be (model I) and Cu (model II) single crystals. The weakly distorted single crystals of Be and Cu were experimentally investigated in the Bragg case of diffraction geometry using Cu Kα 1 radiation by means of double crystal diffractometer. A new experimental procedure was proposed. Using alternative technique for substructure analysis (for instance EBSD) the reliability of analysis based on extinction phenomenon in weakly distorted single crystals has been checked.
Wire steels C80D and C80D Nb obtained by hot dip galvanizing procedure were investigated by optical and electron microscopy as well as by X-ray analysis. The investigations were carried out at different stages of production of wires. The results of the investigations were checked by micro-hardness measurements. Arising of cracks in wires surface during hot dip galvanizing as a reason for decrease in tensile strength was established. Influences of technological parameter such as galvanizing velocity, type of cooling and residual stresses and strength of wires before galvanizing on cracking of wire was taken in consideration.
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