Regensburg 2004 – scientific programme

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M: Metallphysik

M 32: Grenzfl
ächen und Wachstum

M 32.3: Talk

Thursday, March 11, 2004, 17:00–17:15, H4

Grain Growth under the Influence of Mechanical Stress Fields — •Myrjam Winning — Institut für Metallkunde und Metallphysik, RWTH Aachen

The motion of grain boundaries is the key phenomenon of recrystallization and grain growth and dominates the evolution of texture and microstructure, i.e the macroscopic physical and mechanical properties of a material, in particular of a part in service. The reaction of grain boundaries to mechanical stresses is reviewed. It was found that the motion of low angle grain boundaries as well as of high angle grain boundaries can be induced by the imposed external stress. The observed activation enthalpies allow conclusions on the migration mechanism of the stress induced grain boundary motion. From these experiments can be seen that mechanical stress fields can change the dynamical behaviour of grain boundaries. Therefore in the following the influence of mechanical stresses on grain growth was studied. The experiments should investigate the change of the grain growth kinetics as well as the microstructure and texture evolution in polycrystalline high-purity aluminium under the influence of different mechanical stress fields. The fact that boundaries can also be moved by mechanical forces sheds new light on microstructure evolution during elevated temperature deformation.