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MM: Fachverband Metall- und Materialphysik

MM 3: Mechanical Properties I

MM 3.1: Vortrag

Montag, 23. März 2009, 10:30–10:45, IFW B

Periodic Phase Composites in Aluminide Thin Films Produced by Laser Interference Metallurgy - Mechanical and Structural Characterisation — •Peter Leibenguth, Eric Detemple, and Frank Mücklich — Department of Materials Science and Engineering, Functional Materials, Saarland University, Saarbrücken, Germany

Laser Interference Metallurgy is a straightforward means of producing thin film composite materials. By overlapping two or more coherent laser beams on the material surface, an interference pattern can be achieved. Its periodic arrangement of intensity maxima and minima allows the formation of a controlled laterally patterned structure of processed and directly neighbouring unprocessed regions in micron-scale. Besides melting, annealing and recrystallisation, the Laser processing can induce the formation of other phases having significantly different properties.

We concentrate on the effects of this treatment on the mechanical properties of multilayered thin films, whose composition allows the formation of mechanically interesting aluminide phases. For this purpose, we use a nanosecond-pulsed Nd:YAG laser with high peak power whose primary beam is split in two sub-beams by an appropriate beam-splitter and mirror setup. The resulting composite consists of a periodic array of hard and ductile phases. Structure determination is performed by GI-XRD and TEM. Using bulge-testing and nanoindentation, the global and local mechanical properties are analysed.