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Nanometer Scale Mechanical Behavior of Grain Boundaries

Published online by Cambridge University Press:  31 March 2011

Chien-Kai Wang
Affiliation:
School of Engineering, Brown University, Providence, RI 02912, U.S.A.
Huck Beng Chew
Affiliation:
School of Engineering, Brown University, Providence, RI 02912, U.S.A.
Kyung-Suk Kim
Affiliation:
School of Engineering, Brown University, Providence, RI 02912, U.S.A.
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Abstract

A nonlinear field projection method has been developed to study nanometer scale mechanical properties of grain boundaries in nanocrystalline FCC metals. The nonlinear field projection is based on the principle of virtual work, for virtual variations of atomic positions in equilibrium through nonlocal interatomic interactions such as EAM potential interaction, to get field-projected subatomic-resolution traction distributions on various grain boundaries. The analyses show that the field projected traction produces periodic concentrated compression sites on the grain boundary, which act as crack trapping or dislocation nucleation sites. The field projection was also used to assess the nanometer scale failure processes of Cu Σ5 grain boundaries doped with Pb. It was revealed that the Pb dopants prevented the emission of dislocations by grain boundary slip and embrittles the grain boundary.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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References

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