Microstructure versus size: mechanical properties of electroplated single crystalline Cu nanopillars.
We report results of uniaxial compression experiments on single-crystalline Cu nanopillars with nonzero initial dislocation densities produced without focused ion beam (FIB). Remarkably, we find the same power-law size-driven strengthening as FIB-fabricated face-centered cubic micropillars. TEM analysis reveals that initial dislocation density in our FIB-less pillars and those produced by FIB are on the order of 10(14) m(-2) suggesting that mechanical response of nanoscale crystals is a stronger function of initial microstructure than of size regardless of fabrication method.
Jennings
Andrew T
AT
Engineering and Applied Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA.
Burek
Michael J
MJ
Greer
Julia R
JR