Segregation-affected yielding and stability in nanotwinned silver by microalloying

Ke, Xing; Sansoz, Frederic

doi:10.1103/PhysRevMaterials.1.063604

Segregation-affected yielding and stability in nanotwinned silver by microalloying

Journal Article · Thu Nov 30 00:00:00 EST 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.1.063604· OSTI ID:1410783

Ke, Xing ^[1]; ^[2]

Univ. of Vermont, Burlington, VT (United States). Materials Science Program; The University of Vermont
Univ. of Vermont, Burlington, VT (United States). Materials Science Program; Univ. of Vermont, Burlington, VT (United States). Dept. of Mechanical Engineering

Small-scale mechanics of solute atom segregation and incipient plasticity in nanotwinned Ag containing trace concentrations of Cu were studied by using large-scale hybrid Monte-Carlo and molecular-dynamic simulations. It is found that solute Cu atoms are segregated concurrently to grain boundaries and intrinsic twin-boundary kink-step defects during thermal annealing. Low Cu dopant contents below 1 at. % are predicted to substantially increase twin stability in nanotwinned Ag, accompanied with a pronounced rise in yield strength at 300 K. Incipient plasticity is associated with kink-step migration, grain-boundary sliding, and dislocation nucleation from grain boundaries and twin-boundary defects, which are affected by doping. Cu-dependent yield strengthening in doped nanotwinned Ag is shown to correlate with the critical stress required to initiate crystal slip emitted from grain boundaries and twin-boundary defects. Finally, these findings provide fundamental insight into the roles of twin-boundary imperfections on plastic yielding, and offer new clues to further extend the extraordinary stability and strength of nanotwinned metals by microalloying.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Vermont, Burlington, VT (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0016270

OSTI ID:: 1410783

Alternate ID(s):: OSTI ID: 1410729

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 6 Vol. 1; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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