Microscopic failure behavior of nanoporous gold

被引:131
作者
Biener, J [1 ]
Hodge, AM [1 ]
Hamza, AV [1 ]
机构
[1] Lawrence Livermore Natl Lab, Nanoscale Synth & Characterizat Lab, Livermore, CA 94550 USA
关键词
D O I
10.1063/1.2051791
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report on the fracture behavior of nanoporous (np)-Au with an open sponge-like morphology of interconnecting ligaments on the nanometer length scale. Despite its macroscopic brittleness, np-Au is microscopically a very ductile material as ligaments strained by as much as 200% can be observed in the vicinity of crack tips. Cell-size effects on the microscopic failure mechanism were studied by annealing treatments that increased the typical pore size/ligament diameter from similar to 100 nm to similar to 1 mu m. Ligaments with diameter of similar to 100 nm fail by plastic flow and necking, whereas failure by slip was observed for larger ligaments with a diameter of similar to 1 mu m. The absence of slip marks in 100-nm-sized ligaments suggests a strongly suppressed dislocation activity, consistent with the high yield strength of np-Au.
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页码:1 / 3
页数:3
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