Heterogeneous deformation of polycrystalline materials is established through mapping the strain fields on the surface of a Ni-based superalloy. This novel experimental set-up combines strain field mapping from digital image correlation (DIC) with microstructure information from electron backscatter diffraction (EBSD) during ex-situ loading. The results produce sub-micron spatial resolution of the strain fields on the surface of the specimen. Given the orientation information from EBSD, the strain can be decomposed into individual slip systems. Thereby allowing measurements of high-resolution strain heterogeneities at the interface with characterization of the interface structure, which is an excellent complement to the atomistic simulations of slip-GB interactions. This experimental technique provides means for verifying and validating modeling efforts.
Project Sponsors: the U.S. Air Force Research Laboratory
Collaborators: Wael Abuzaid, John Lambros, Jay Caroll, and Huseyin Sehitoglu (University of Illinois, Urbana-Champaign)
Abuzaid W, Sangid MD, Carroll J, Sehitoglu H, Lambros J, “Slip transfer and plastic strain accumulation across grain boundaries in Hastelloy X,” Journal of the Mechanics and Physics of Solids 60 1201-1220 (2012).
Abuzaid W, Sangid MD, Sehitoglu H, Carroll J, Lambros J, “The role of slip transmission on plastic strain accumulation across grain boundaries,” Procedia IUTAM, International Union of Theoretical and Applied Mechanics, University of Cachan, Paris, France, July 3-8, 2011.