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- W2125957814 endingPage "6026" @default.
- W2125957814 startingPage "6013" @default.
- W2125957814 abstract "Atomistic simulations using the quasicontinuum method are performed to examine the mechanical behavior and underlying mechanisms of surface plasticity in nanocrystalline aluminum with a grain diameter of 7 nm deformed under wedge-like cylindrical contact. Two embedded-atom method potentials for Al, which mostly differ in their prediction of the generalized stacking and planar fault energies, and grain boundary (GB) energies, are used and characterized. The simulations are conducted on a randomly oriented microstructure with 〈1 1 0〉-tilt GBs. The contact pressure–displacement curves are found to display significant flow serration. We show that this effect is associated with highly localized shear deformation resulting from one of three possible mechanisms: (1) the emission of partial dislocations and twins emanating from the contact interface and GBs, along with their propagation and intersection through intragranular slip, (2) GB sliding and grain rotation and (3) stress-driven GB migration coupled to shear deformation. Marked differences in mechanical behavior are observed, however, as a function of the interatomic potential. We find that the propensity to localize the plastic deformation at GBs via interface sliding and coupled GB migration is greater in the Al material presenting the lowest predicted stacking fault energy and GB energy. This finding is qualitatively interpreted on the basis of impurity effects on plastic flow and GB-mediated deformation processes in Al." @default.
- W2125957814 created "2016-06-24" @default.
- W2125957814 creator A5072934773 @default.
- W2125957814 creator A5018791965 @default.
- W2125957814 date "2008-12-01" @default.
- W2125957814 modified "2023-09-25" @default.
- W2125957814 title "Quasicontinuum study of incipient plasticity under nanoscale contact in nanocrystalline aluminum" @default.
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