Biener Juergen, Hodge Andrea M, Hayes Joel R, Volkert Cynthia A, Zepeda-Ruiz Luis A, Hamza Alex V, Abraham Farid F
Nanoscale Synthesis and Characterization Laboratory, Lawrence Livermore National Laboratory, P.O. Box 808, L-367, Livermore, California 94550, USA.
Nano Lett. 2006 Oct;6(10):2379-82. doi: 10.1021/nl061978i.
Recent nanomechanical tests on submicron metal columns and wires have revealed a dramatic increase in yield strength with decreasing sample size. Here, we demonstrate that nanoporous metal foams can be envisioned as a three-dimensional network of ultrahigh-strength nanowires, thus bringing together two seemingly conflicting properties: high strength and high porosity. Specifically, we characterized the size-dependent mechanical properties of nanoporous gold using a combination of nanoindentation, column microcompression, and molecular dynamics simulations. We find that nanoporous gold can be as strong as bulk Au, despite being a highly porous material, and that the ligaments in nanoporous gold approach the theoretical yield strength of Au.
最近对亚微米级金属柱和金属丝进行的纳米力学测试表明，随着样品尺寸减小，屈服强度显著增加。在此，我们证明纳米多孔金属泡沫可被设想为超高强度纳米线的三维网络，从而将两个看似相互矛盾的特性——高强度和高孔隙率——结合在一起。具体而言，我们结合纳米压痕、柱微压缩和分子动力学模拟，对纳米多孔金的尺寸依赖性力学性能进行了表征。我们发现，尽管纳米多孔金是一种高孔隙率材料，但其强度可与块状金相当，且纳米多孔金中的金属韧带接近金的理论屈服强度。
