Forming incoherent twin boundaries: a new way for nanograin growth under cyclic loading

Abstract

Obvious grain growth was observed in regions around the fatigue cracks in the Au thin films under cyclic loading. Dominant generation of twin boundaries (TBs) and low-angle grain boundaries was observed in the coarsened grains. The experimental evidence shows that the newly formed TBs are mainly incoherent TBs, rather than the classical coherent TBs.

Keywords

• Grain growth
• Grain boundary
• Twin boundary
• Nanocrystalline
• Fatigue