OSCILLATION OF STRUCTURE CHARACTERISTICS IN POLYCRYSTALLINE NICKEL DURING PLASTIC-DEFORMATION

The variation of X-ray-diffraction characteristics (breadth at half ma ximum intensity, integrated intensity, dislocation density and residua l stresses), as a function of plastic deformation rate, which occurs b y uniaxial tensile test, has been studied, At room temperature the obs erved oscillation of studied characteristics in deformed polycrystalli ne nickel is due to the deformation mechanism change. The latter can b e a translational displacement due to dislocations or a rotational dis placement due to disclinations.