Article ID Journal Published Year Pages File Type
7971589 Materials Science and Engineering: A 2018 18 Pages PDF
Abstract
Microcompressive tests were performed to investigate the intrinsic modulation effect and extrinsic diameter effect on strength and deformation behaviors of nanolaminated Cu/Cu-Zr crystalline/amorphous micropillars within a diameter D range from 300 to 1500 nm as well as a modulation ratio η range from 0.1 to 3.0. Experimental results revealed a transition of D-dependent deformation mode from homogeneous-like to shear localization at large η, while D-independent homogeneous extrusion of Cu at small η. Furthermore, the flow strength increased with raising D at small η, but decreased at large η, exhibiting a D-insensitive strength at a critical η* ~ 0.5. These unusual results were rationalized in terms of a coupling effect of dislocation actions and shear transformation zone mediated operations.
Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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