期刊
SMALL
卷 8, 期 12, 页码 1889-1894出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201101911
关键词
copper nanowires; in situ tensile tests; micromechanical devices; size-dependent fracture modes
类别
资金
- Air Force Office of Sponsored Research (AFOSR) YIP award [FA9550-09-1-0084]
- Air Force Research Laboratory [AFRL FA8650-07-2-5061]
- NSF [DMR-1128818, CMMI-0928297]
- NSF-MRSEC Program [DMR-0819885]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1128818] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0928297] Funding Source: National Science Foundation
In situ uni-axial tensile tests of single-crystalline copper nanowires are performed using a micromechanical device inside a scanning electron microscope chamber. The single-crystalline copper nanowires are synthesized by solvothermal processes, and the growth direction along the wire axis is the < 110 > orientation as confirmed by transmission electron microscopy (TEM) selected area diffraction (SAD) analysis. The fracture strengths of copper nanowires are found to be much higher than that of bulk copper. More interestingly, both ductile and brittle-like fracture modes are found in the same batch of fabricated nanowires, and the fracture modes appear to be dependent on the diameters of tested nanowires. From the analysis of fracture surfaces, sample morphologies and corresponding stressstrain curves, the competition between deformation and fracture mechanisms controlled by initial defects density and by the probability of dislocation interactions is attributed to this intriguing size-dependent fracture mode transition.
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