Size effects on the mechanical behavior of nanoporous Au
Size effects on the mechanical behavior of nanoporous Au
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DOI：
10.1021/nl061978i
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发表时间：
2006-10-11
期刊：
影响因子：
10.8
通讯作者：
Abraham, Farid F.
中科院分区：
文献类型：
--
作者：
Biener, Juergen;Hodge, Andrea M.;Abraham, Farid F.
最近对亚微米金属柱和金属丝的纳米力学测试表明，随着样品尺寸的减小，屈服强度显著增加。在这里，我们证明了纳米多孔金属泡沫可以被设想为一个超高强度纳米线的三维网络，从而将两个看似矛盾的特性结合在一起：高强度和高孔隙率。具体来说，我们使用纳米压痕、柱微压缩和分子动力学模拟相结合的方法来表征纳米多孔金的尺寸依赖性机械性能。我们发现，尽管纳米多孔金是一种高度多孔的材料，但它可以像大块金一样坚固，而且纳米多孔金的韧带接近金的理论屈服强度。
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.