Spherical indentation response of a Ni double gyroid nanolattice

• Main Authors: Prusty, R. K., Narayan, R. L., Scherer, M., Steiner, U., Deshpande, V. S., Fleck, N. A., Ramamurty, Upadrasta
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Mechanical engineering; Cellular Material; Nanoindentation
• Online Access: https://hdl.handle.net/10356/162008
• Institution: Nanyang Technological University

The effect of indentation strain εi upon hardness H and elastic modulus E of a Ni Double Gyroid (DG) nanolattice was investigated using a spherically-tipped nanoindenter. H remains invariant, while E decreases linearly, with increasing εi. Results reveal the progressive collapse of the DG lattice beneath the indenter. The measured values of H and extrapolated value of E at εi = 0 were used to estimate the yield strength and elastic modulus of the Ni cell walls. The latter was compared with the ideal strength of Ni, nanocrystalline films and of sub-100 nm diameter single crystals.