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Meeting MS&T23: Materials Science & Technology
Symposium Additive Manufacturing of High and Ultra-high Temperature Ceramics and Composites: Processing, Characterization and Testing
Presentation Title Residual Stress in Additively Manufactured Alumina via Stereolithography
Author(s) James Nance, Kevin Strong, Dale Cillessen
On-Site Speaker (Planned) James Nance
Abstract Scope Thermo-residual stresses in alumina microstructures are a result of the thermal expansion mismatch between the different crystallographic planes. Additive manufacturing of alumina via stereolithography results in a textured microstructure. The purpose of this study is to compare the microstructural thermo-residual stresses of additive manufactured vs. conventional processing of alumina. Residual stresses were characterized for different processing methods via photoluminescence spectroscopy (PLS). PLS spectra maps with micrometer spatial resolution was collected for each processing method. Characteristic chromium emission peaks were identified in the microstructure of the alumina and residual stress was determined by measuring the shift in the peak intensities. Spectra were collected in the green state (“stress-free”) and after sintering to determine how residual stresses evolve as a result of the processing technique used. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525


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