Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 27: Interfaces I

MM 27.5: Vortrag

Mittwoch, 25. März 2009, 12:30–12:45, IFW B

THE FINITE MOBILITY OF THE BOUNDARY JUNCTIONS AND THE THEORETICAL PREDICTIONS OF GROWTH RATE FOR POLYCRYSTALS UNDERGOING GRAIN GROWTH — •Luis Barrales-Mora — Institut für Metallkunde und Metallphysik, RWTH-Aachen, Aachen, Germany

As a consequence of the recent demonstration of the three-dimensional von Neumann-Mullins relationship by MacPherson and Srolovitz, there has been a renewed interest in the investigation of the phenomenon known as grain growth. This interest arises from the many possibilities that this new relationship offers but also, and contradictorily, from its limitations. One of such limitations is the impossibility of this relationship to predict correctly the volume rate of change of grains if the motion of the grain boundaries is hindered. It is well known that many factors can hinder the grain boundary motion, e.g., second-phase particles, impurity atoms, the finite mobility of the boundary junctions, etc. In the present contribution, the latter factor is analysed in light of the Cahn-MacPherson-Srolovitz relationship by means of computer simulations. This relationship is coupled with theories on the finite mobility of triple lines and quadruple junctions and compared with simulation results in single grains. Similar relationships by Glicksman and Rios and Hilgenfeldt et al. are also investigated. This last point is relevant since these approaches allow the study of grain growth from a more statistical point of view.