|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||I-4: Development of a Constitutive Model for Plastic Deformation in Single Crystal Niobium
||Eureka Pai Kulyadi, Philip Eisenlohr
|On-Site Speaker (Planned)
||Eureka Pai Kulyadi
Non-Schmid effects influence the orientation dependence and tension–compression asymmetry of the yield stress in body-centered cubic (bcc) metals such as Nb. In this study, we conduct compression tests on a set of Nb single crystals and perform trace analysis using electron microscopy as well as calculate the local strain fields using Digital Image Correlation and relate it to existing data from tension tests. A constitutive model for plastic deformation in Nb that captures non-Schmid behavior is formulated by incorporating material specific dislocation strengthening coefficients that depend on the dislocation interaction mechanisms in play, and the deviation of the screw dislocation trajectory from the average glide plane, which modifies the Peierls stress for dislocation motion. The results from the adopted model are compared to those from the deformation experiments.
This work is supported by the U.S Department of Energy, Office of High Energy Physics, grant number DE-SC0009962.
||Planned: Supplemental Proceedings volume