|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Characterization of the Elastic Properties and Microstructure of SLM Al-10Si-Mg
||David Witkin, Scott Sitzman, Yong Kim, Paul Adams, Robert Castaneda
|On-Site Speaker (Planned)
The microstructure and elastic properties of SLM Al-10Si-Mg in as-built and heat treated conditions were characterized for commercially produced samples. Coefficient of Thermal Expansion (CTE) did not vary between the in-plane and vertical build directions. Elastic moduli did consistently vary in these directions, but at a similar magnitude to variation found between transverse and longitudinal directions in extruded Al 6061-T6 bar. Electron back-scatter diffraction (EBSD) revealed a bimodal microstructure consisting of a coarser grained interior of the melt pool transect that exhibited preferred crystallographic orientation surrounded by a fine-grained region that was more randomly oriented but had signatures of directional solidification. X-ray computed tomography (CT) was used to characterize porosity, which are not randomly distributed but more prevalent where contour intersected interior fill passes. Ultrasonic measurements of elastic properties also yielded two-dimensional information about the distribution and size of pores.
||Planned: Supplemental Proceedings volume