Mesoscopic Measurement and Modeling of Slip Transfer Across Boundaries in Anisotropic Metallic Systems.

摘要

An integrated experimental and theoretical approach to measure and model deformation transfer and microcrack initiation at grain boundaries is being developed. Electron channeling contrast imaging (ECCI) was used to directly image deformation defects associated with strain transfer and/or crack nucleation at grain boundaries. ECCI observations were correlated with mesoscale crystallographic texture information measured by selected area channeling patterns (SACPs), electron backscattered diffraction (EBSD) and x- ray texture measurements. To interpret and model these observed grain boundary deformation and strain accommodation phenomena, a nonlinear variational model of plastic deformation in a bicrystal that couples bulk grain deformation with compatibility enforced at the grain boundary was partially developed.