Grain boundary control during high temperature low cycle fatigue

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Abstract
Conspicuous microstructural changes were observed for a variety of metallic materials during elevated temperature cyclic deformation, owing to grain growth, grain boundary motion and reorientation of the grain boundaries under 45° with respect to the stress axis. These phenomena are associated with an obvious change of microtexture and orientation correlation between neighbouring grains. The current investigation focused on the evolution of microstructure and microtexture during high temperature low cycle fatigue in pure nickel. The orientations of the individual grains were determined by means of the electron backscattering diffraction technique in a scanning electron microscope. The spatial arrangement of the grain boundaries was measured using optical microscopy. The results are discussed with regard to the effect of grain boundary character on the propensity for grain boundary damage by motion and alignment. Résumé Nous avons observé des changements microstructurels visibles pour une variété ...

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