Regensburg 2007 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 6: Interfaces II

MM 6.1: Vortrag

Montag, 26. März 2007, 11:45–12:00, H6

The role of quadruple points on grain microstructure evolution — •Volker Mohles, Luis Antonio Barrales-Mora, Lasar Shvindlerman, and Günter Gottstein — Institut für Metallkunde und Metallphysik, RWTH Aachen, 52056 Aachen

It is well known that triple junctions between grains can have a significant influence on grain microstructure evolution. Now the effect of quadruple points on grain microstructure evolution has been investigated by computer simulations. For this purpose, a special grain assembly was employed. This special configuration allows a steady-state motion of the grain boundaries, permitting to study the effect of a finite mobility of the quadruple points on the evolution of the system. Numerous simulations, by means of a 3D Vertex Model, were performed varying the quadruple point mobility. The results of these simulations clearly demonstrate that quadruple points can drag grain growth kinetics. However, further simulations on the same configuration but for different triple junction mobilities showed that the dragging effect of triple junctions is considerably larger than the effect of quadruple points.