Description

The statistical characteristics of dislocation-induced elastic distortion fields in deformed FCC crystals are -investigated both experimentally and theoretically. Discrete dislocation realizations are generated by the discrete -dislocation dynamics method and the induced elastic distortion fields are computed by solving the corresponding boundary value problem. Moreover, sample three-dimensional X-ray measurements for the lattice misorientation are also presented to address the corresponding statistical features and to highlight the possibility to conduct a comparison between experiments and dislocation dynamics simulations. This analysis addresses critical issues related to the similarities and differences, in terms of the spatial characteristics, between the elastic strain and lattice rotation fields induced by the same dislocation structure. Moreover, the significance of the elastic strain field contribution to the dislocation density tensor, which is usually considered insignificant during the experimental detection of the dislocation density tensor, is also investigated quantitatively. Finally, we present a preliminary comparison between the elastic distortion fields computed based on discrete dislocation simulations and those measured experimentally through 3D X-ray microscopy. This study was supported by the U.S. DOE Office of Basic Energy Sciences, Division of Materials Science & Engineering.

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Investigation of the elastic distortion fields for deformed FCC crystals: discrete dislocation dynamics simulations and experimental measurements

The statistical characteristics of dislocation-induced elastic distortion fields in deformed FCC crystals are -investigated both experimentally and theoretically. Discrete dislocation realizations are generated by the discrete -dislocation dynamics method and the induced elastic distortion fields are computed by solving the corresponding boundary value problem. Moreover, sample three-dimensional X-ray measurements for the lattice misorientation are also presented to address the corresponding statistical features and to highlight the possibility to conduct a comparison between experiments and dislocation dynamics simulations. This analysis addresses critical issues related to the similarities and differences, in terms of the spatial characteristics, between the elastic strain and lattice rotation fields induced by the same dislocation structure. Moreover, the significance of the elastic strain field contribution to the dislocation density tensor, which is usually considered insignificant during the experimental detection of the dislocation density tensor, is also investigated quantitatively. Finally, we present a preliminary comparison between the elastic distortion fields computed based on discrete dislocation simulations and those measured experimentally through 3D X-ray microscopy. This study was supported by the U.S. DOE Office of Basic Energy Sciences, Division of Materials Science & Engineering.