Nanoporous Au: A high yield strength material

被引：284

作者：

Biener, J ^{[1
]}

Hodge, AM ^{[1
]}

Hamza, AV ^{[1
]}

Hsiung, LM ^{[1
]}

Satcher, JH ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Nanoscale Synth & Characterizat Lab, Livermore, CA 94550 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2005年 / 97卷 / 02期

关键词：

D O I：

10.1063/1.1832742

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The plastic deformation of nanoporous Au under compressive stress was studied by depth-sensing nanoindentation combined with scanning electron microscope characterization. The nanoporous Au investigated in the current study exhibits a relative density of 42%, and a spongelike morphology of interconnecting ligaments on a length scale of similar to100 nm. The material is polycrystalline with a grain size on the order of 10-60 nm. Microstructural characterization of residual indentation impressions reveals a localized densification via ductile (plastic) deformation under compressive stress and demonstrates the ductile behavior of Au ligaments. A mean hardness of 145(+/-11) MPa and a Young's modulus of 11.1(+/-0.9) GPa was obtained from the analysis of the load-displacement curves. The hardness of investigated np-Au is similar to10 times higher than the hardness predicted by scaling laws of open-cell foams thus potentially opening a door to a class of high yield strength-low-density materials. (C) 2005 American Institute of Physics.

引用

页数：4

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