Diffraction post-processing of 3D dislocation dynamics simulations for direct comparison with micro-beam Laue experiments

作者：Hofmann Felix^*; Keegan Sinead; Korsunsky Alexander M

来源：Materials Letters, 2012, 89: 66-69.

DOI：10.1016/j.matlet.2012.08.052

• Defects
• Dislocation dynamics simulations
• Synchrotron micro-beam Laue diffraction

We present a method of computing lattice rotations and elastic strains due to 3D dislocation structures discretised into straight segments. Combined with ray-tracing, it enables virtual scattering experiments where X-ray diffraction patterns that would arise from such dislocation structures are simulated. We demonstrate the diffraction post-processing of a Frank-Read source simulated using the ParaDiS discrete dislocation dynamics code. This simulation is compared to experimental synchrotron X-ray micro-beam Laue diffraction measurements of a single grain within a deformed nickel polycrystal. The simulated pattern captures the experimentally observed anisotropic broadening of Laue reflections and illustrates that heterogeneous and anisotropic lattice (re)orientation effects dominate the peak shape.

• 出版日期2012-12-15
• 单位东北大学