Abstract
Former studies of grain boundaries in metal tips concern static crystallographic problems. In this study we describe temperature increase induced evolutions of grain boundaries in very clean tips (Ni, W, Ta). Results of scanning electron microscope studies are: (1) The initial boundaries migrate to form a system of parallel boundaries. (2) A bamboo-structure boundary migrates towards the tip end but stops at the tip end neck. (3) Measurable boundary grooves are formed. Results of field electron microscope studies are: (1) A migration of the intersection line of the boundary and the surface is directly visible on the screen. (2) Twin boundaries are visible and analysable. (3) The tip end crystal can rotate at the grain boundary until the boundary disappears. It is discussed why such type of experiments are promising for future studies of fundamental recrystallization problems.
Published Version
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