Nanoporous Au: A high yield strength material

摘要: The plastic deformation of nanoporous Au under compressive stress was studied by depth-sensing nanoindentation combined with scanning electron microscope characterization. investigated in the current study exhibits a relative density 42%, and spongelike morphology interconnecting ligaments on length scale ∼100nm. material is polycrystalline grain size order 10–60nm. Microstructural characterization residual indentation impressions reveals localized densification via ductile (plastic) demonstrates behavior ligaments. A mean hardness 145(±11)MPa Young’s modulus 11.1(±0.9)GPa obtained from analysis load-displacement curves. np‐Au ∼10 times higher than predicted scaling laws open-cell foams thus potentially opening door to class high yield strength—low-density materials.