Modeling Grain Boundary Interfaces in Pure Nickel
This work presents a three tiered modeling approach to examine grain boundary interfaces in a pure Nickel foil material utilizing a crystal plasticity based finite element model (CPFEM). The goal of this work is to calibrate a modeling approach through comparison to experimental data, and then use the models to gain insight into deformation at grain boundaries in Nickel and Nickel-base superalloy polycrystals. The first study utilizes a multi-crystal micro-tension specimen and simulations to calibrate the CPFEM model and examine the development of “hot-spots” or localized plasticity near the grain boundaries. Some orientation combinations exhibit localized plasticity along the boundary (bad-actor boundaries) while others do not. Insight from the deformation of this model is then used to instantiate simulations of Nickel bi-crystals which exhibit localized plasticity near the boundary. The third study embeds the grain boundary interfaces of interest, as determined from the bi-crystal simulations, into a larger polycrystalline simulation utilizing the same CPFEM framework. Using these interfaces we study deformation at these “characteristic” interfaces when subjected to the generalized loading conditions present in a polycrystalline microstructure.
KeywordsCrystal-Plasticity Finite Elements Grain Boundary Deformation
Unable to display preview. Download preview PDF.
- 7.Wheeler R, Shade P A, and Uchic M D 2012 Insights gained through image analysis during in-situ micromechanical experiments JOM In pressGoogle Scholar
- 10.Anderson A, Cooper R, Neely R, Nichols A, Sharp R, Wallin B 2003 Users manual for ALE3D—an arbitrary Lagrange/Eulerian 3D code system Technical Report UCRL-MA-152204, Lawrence Livermore National Laboratory Google Scholar
- 11.Hosford WF, The Mechanics of Crystals and Textured Polycrystals (New York, NY, Oxford University Press, 1993)Google Scholar