Evaluation of Stacking Fault Energy in Anisotropic FCC Metal by Nanoindentation

Abstract

Stacking fault energy (SFE) is one of the most important mechanical properties in structural material, which is the energy increment due to stacking sequence distortion caused by partial dislocations. New method for evaluating stacking fault energy by nanoindentation was suggested based on continuum model considering dislocation nucleation and stacking fault energy. The self-energy of dislocation and resolved shear stresses at dislocation nucleation were calculated in elastically anisotropic material with cubic structure. For the elastic self-energy, Chus formulations were used. Nanoindentation experiment, electron backscatter diffraction (EBSD) analysis, and finite element (FE) simulation of nanoindentation were combined. The obtained dislocation nucleation shear stress was in the order of theoretical strength of dislocation nucleation and the stacking fault energy evaluated was on the range of reported SFE values.