3, Cornell University, Ithaca, New York, United States
2, Air Force Research Laboratory (AFRL), Dayton, Ohio, United States
High-Energy Diffraction Microscopy (HEDM) is a technique for use of synchrotron radiation in study of polycrystalline materials. Advances in detector technology and supporting software play a significant role in the development of this technique. Applied to the in situ study of deformation, HEDM enables the study of transient response in structural alloys. The identification of slip system activity, kinetics of different slip modes, intragranular slip gradients and the intermittency of plastic flow will be shown. Of particular note, the capability to resolve the (tensorial) state of stress at the scale of individual grains provides for drawing association between transient response and particular modes of crystallographic slip. The presentation will survey several examples that show intermittent and transient response. Attention will be given to the development of constitutive models accounting for the kinetics of crystallographic slip.