Abstract for the talk at 29.01.2007 (12:00 h)Oberseminar MATERIALS
Frank Mücklich (Universität des Saarlandes)
Laser-Interference-Metallurgy - long range ordered micro/nano surface architectures through interference
Tailoring of micro structures and surface functionalization are key goals in the technology of materials. Starting from nature we are able to learn, that well adapted periodical microstructures in small dimensions perform superior composite effects. A new technology, allowing a quick and geometrically precise and direct structuring of long range ordered periodical microstructures at artificial material surfaces, the so-called "Laser Interference Metallurgy" is presented. Basically, the high power Laser pulse is split into several coherent sub beams which interfere on the surface of the sample. The shape and the dimensions of the interference pattern as well as its periodicity can be controlled by the angular and the intensity arrangement of the sub beams. Due to the high and localised periodical intensity distribution of the nanosecond laser pulse a redesign of the surface microstructure in terms of the polycrystal formation, phase arrangement, texture, residual stresses or topography is possible. Various examples demonstrate the versatility of this technique for long range ordered surface architectures and controlled properties.