Size-dependent mechanical properties of molybdenum nanopillars

Kim, Ju-Young; Greer, Julia R.
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p101916
Academic Journal
We report the deformation behavior of single crystalline molybdenum nanopillars in uniaxial compression, which exhibits a strong size effect called the “smaller is stronger” phenomenon. We show that higher strengths arise from the increase in the yield strength rather than through postyield strain hardening. We find the yield strength at nanoscale to depend strongly on sample size and not on the initial dislocation density, a finding strikingly different from that of the bulk metal.


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