Investigation of processing parameters for laser powder bed fusion additive manufacturing of bismuth telluride
Joy Gockel, Ph.D. (Advisor); Henry D. Young, Ph.D. (Committee Member); Raghavan Srinivasan, Ph.D., P.E. (Committee Member)
Master of Science in Materials Science and Engineering (MSMSE)
This work investigates processing parameters for laser powder bed fusion (LPBF) additive manufacturing (AM) to produce bismuth telluride coupons. AM provides the ability to fabricate complex geometries, reduce material waste, and increase design flexibility. The processing parameters for LPBF were varied in single bead experiments guided by analytical modeling to identify conditions that result in uniform beads. Coupons were built using these processing parameters and the cross-sections characterized using optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive x-ray spectroscopy (EDS). Porosity analysis using OM concluded most coupons had porosity levels less than 10% by area. SEM and EDS analysis revealed there were slight composition and microstructure variations throughout the cross-sections depending on the processing conditions. These results show that LPBF is a viable process for producing bismuth telluride coupons with low porosity. Investigations of the microstructure and composition of the coupons indicate further research opportunities.
Department or Program
Department of Mechanical and Materials Engineering
Year Degree Awarded
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