Size-dependent mechanical properties of molybdenum nanopillars | Zendy

JuYoung Kim | Zendy; Julia R. Greer | Zendy

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Size-dependent mechanical properties of molybdenum nanopillars

Author(s) -

JuYoung Kim,

Julia R. Greer

Publication year - 2008

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2979684

Subject(s) - nanopillar , materials science , molybdenum , strain hardening exponent , dislocation , nanoscopic scale , hardening (computing) , yield (engineering) , composite material , deformation (meteorology) , condensed matter physics , nanotechnology , metallurgy , nanostructure , physics , layer (electronics)

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.open363

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