Berlin 2005 – wissenschaftliches Programm

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M: Metallphysik

M 25: Material Design

M 25.1: Vortrag

Samstag, 5. März 2005, 14:45–15:00, TU H2038

Consolidation Process during Diffusion Bonding in Continuous Al2O3 Fiber-reinforced NiAl Composites — •Hao Chen, Weiping Hu, Yunlong Zhong, and Günter Gottstein — Institute of Physical Metallurgy and Metal Physics, RWTH Aachen, 52056, Aachen, Germany

A theoretical model for solid-state diffusion bonding during the consolidation process of continuous Al2O3 fiber reinforced NiAl composites has been presented. The aim of which was to evaluate the operated mechanisms for consolidation and to determine the optimal hot pressing parameters (time, temperature, pressure). It was found that plastic deformation caused by creep was dominant mechanism in the consolidation process at high temperatures and high pressures. Only in the final collapse of the porosities, the diffusion mechanisms (surface diffusion, volume diffusion and grain boundary diffusion) played a relative important role. The effects of fiber volume fraction and the arrangement of the matrix-coated fibers were also analyzed. Different dense composites were fabricated according to the predicted processing parameters, and good agreement between experimental results and predictions from the model was achieved.