5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P2.180 Structural and micromechanical investigation of multi compositional tungsten thin film alloys produced by magnetron sputtered co-deposition process

6 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 180
Poster I. Materials Technology P2 Poster session

Speaker

Vladica Nikolic (Erich Schmid Institute of Materials Science of the Austrian Academy of Sciences)

Description

In order to investigate possible enhancement of mechanical properties of tungsten (W) based materials by solid solutions and to examine the influence of a single alloying element on a particular property such as ductility, a versatile production method of generating a wide range of different tungsten binary alloys is presented. Magnetron sputter co – deposition was used to produce thin films of W binary alloys with defined compositional gradients, on 200 μm thick cold – rolled tungsten substrate, yielding film thicknesses between 1-2,5 μm. Three alloys were studied: W – Fe (0-6at %), W – Ti (0-12at %) and W – Ir (0-10at %). Using this combinatorial materials method, detailed microstructural and micromechanical investigations can be performed. A scanning electron microscope equipped with electron backscattered diffraction detector was used to determine the microstructure of the alloys, analyse the texture and the grain orientation, and to investigate the variation of the microstructure in respect to the alloying content. Different heat treatments reveal a significant grain growth above 1300°C with a clear texture transition when reaching higher temperatures. Mapping of chemical composition as a function of position on the wafer / tungsten substrate was performed using energy dispersive X – ray spectroscopy and the surface roughness was obtained with atom force microscopy. Micromechanical testing techniques, including 3–point bending experiments and nanoindentation, were performed in order to study fracture behaviour and ductility of produced tungsten film alloys.

Co-authors

Alan Savan (Institute for Materials, Ruhr-Universität Bochum, 44780 Bochum, Germany) Alfred Ludwig (Institute for Materials, Ruhr-Universität Bochum, 44780 Bochum, Germany) Reinhard Pippan (Erich Schmid Institute of Materials Science of the Austrian Academy of Sciences, 8700 Leoben, Austria) Stefan Wurster (Department of Materials Physics, Montanuniversität Leoben, 8700 Leoben, Austria) Vladica Nikolic (Erich Schmid Institute of Materials Science of the Austrian Academy of Sciences, 8700 Leoben, Austria)

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