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Additive manufacturing of aluminum alloy with high silicon content

: Hilpert, E.; Risse, S.

American Ceramic Society -ACerS-, Westerville/Ohio; Association for Iron & Steel Technology -AIST-:
Materials Science & Technology Conference and Exhibition, MS&T 2015. Vol.1 : Columbus, Ohio, USA, 4 - 8 October 2015
Red Hook, NY: Curran, 2015
ISBN: 978-1-5108-1393-9
Materials Science & Technology Conference and Exhibition (MS&T) <2015, Columbus/Ohio>
Conference Paper
Fraunhofer IOF ()

The presented paper addresses the fabrication of an aluminum alloy with high silicon content by an additive manufacturing technique. AISi alloys are of particular interest because of the increased specific stiffness and the decreased coefficient of thermal expansion. In this study, an aluminum powder containing 39.4 % Si by weight with a particle size of 20-63 μn was processed by selective laser melting. After completing first parameter studies, solid parts could be manufactured, enabling the production of test samples for the analysis of material properties. Prior to the investigation the parts have been further manufactured by lathing or polishing techniques to generate smooth surfaces. The resulting samples were then analyzed with respect to density, microstructure and mechanical strength. Furthermore their chemical composition was evaluated using various methods, e.g. energy dispersive X-ray analysis. Deviations compared to the initial powder composition are discussed.