Quantitative characterization of slip damage evolution in nickel-based single crystal superalloy by sampling moiré method

The slip accumulation induces microscale plastic localization, often leading to irreversible damage in nickel-based single-crystal superalloys. While most studies have quantitatively described plastic localization through numerical simulations, few experiments have characterized the microscale inhomogeneous strain distribution of slip damage. In this study, we employed the sampling moiré method to measure the sub-microscale strain and displacement fields in nickelbased single-crystal superalloys under tensile loading. Our analysis quantitatively assessed the formation of slip traces and the evolution of slip bands during mechanical loading, providing valuable insights into the mechanisms of slip damage. The sampling moiré method can obtain sufficient high spatial resolution by reducing the pitch of the deformation carrier grids, demonstrating its superiority in microscale deformation measurements and its potential for characterizing the mechanical behavior of materials.