Figure 4
From: High strength metallic wood from nanostructured nickel inverse opal materials
(a) Nanoindentation hardness measurements versus total solids volume fraction of the inverse opal materials. The black dots are numerical predictions of the hardness measurements from finite element simulations. (b) Nominal hardness (hardness normalized by the yield strength) versus total solids volume fraction of several uncoated and nickel-coated nickel inverse opal materials. The flow stress at 10% strain is used as the yield strength for the nominal hardness measurements. The black dots are numerical predictions of the nominal hardness. (c) Ashby plot of material strength, calculated at a 0.2% strain offset, versus density for the fabricated materials and several reference materials. (d) Ashby plot of specific modulus and specific strength of the fabricated materials and several reference materials. For comparison in (c) and (d), common Ti, Al, Ni, and Fe high strength alloys are labeled as follows 1 - CP Ti, 2 - 2024-T4, 3 - Inconel 718, 4 - 7075-T6, 5 - HSSS steel, 6 - Ti-6Al-4V, 7 - Ti-10V-2Fe-3Al31,32,67,68. Error bars show standard deviations.
