centration at grain boundary due to piled up dislocations, local mml migration of grain boundary occurs, revealing corrugated shape of grain boundary. The abnormal hardening of grain-inside will promote the grain boundary sliding, by which W-type cracks or voids are formed along the corrugated boundary or at the triple point of boundaries. The interlinking of those cracks forms and the extensive migration of grain boundaries may dissipate the stress concentration and the crack growth along grain boundaries, leading to the recovery of ductility. Those behaviors are confirmed by the present metallographic study through optical micrography and electron fractography. (Received_January 20, 1970) ally been attributed to the impurities segregated on grain boundaries. Scientific researches in this regard so far has remained far from touching the core of the. matter.
strain to initiate serrations contralily moves toward the high strain side as temperature rises, with serrations of downward jerk appearing only in a limited region of strain. Furthermore, immediately after disappearance of the serrations, abnormal work hardening phenomenon is observed.These phenomena are discussed from the point of view of the interaction between solute atoms and dislocations and of the grain boundary behaviors at elevated temperatures.
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