Reversing inverse Hall-Petch and direct computation of Hall-Petch coefficients

Henager, Charles H.

doi:10.1016/j.actamat.2023.119627

Reversing inverse Hall-Petch and direct computation of Hall-Petch coefficients

Journal Article · Thu Dec 21 23:00:00 EST 2023 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2023.119627· OSTI ID:2342118

^[1]

Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

A 2D bicrystal atomistic model of dislocation transmission through a Σ11<101>{131} symmetric-tilt grain boundary reveals details of Hall-Petch breakdown in the single dislocation regime in Al, Ni, and Cu. Partly based on a previous study, this research determines the stress required for a single dislocation to be transmitted through the Σ11 boundary and finds that single dislocation transmission typically deviates from Hall-Petch behavior because the leading partial dislocation becomes trapped in the boundary and emits glissile grain boundary disconnections that cause boundary sliding deformation at stresses well below boundary transmission stresses. Thus, mechanisms of inverse Hall-Petch, namely grain boundary shear and sliding, are shown to operate in lieu of grain boundary transmission in the single dislocation regime. However, by controlling the applied stresses, inverse Hall-Petch can be reversed and typical Hall- Petch grain boundary transmission regained. This, in turn, allows the direct computation of Hall-Petch coefficients. Further, a second dislocation on the same slip plane preserves typical Hall-Petch behavior for Al and Ni and does not lead to boundary sliding events, thus implying a critical grain size for Hall-Petch breakdown based on the pileup model.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2342118

Alternate ID(s):: OSTI ID: 2274721

Report Number(s):: PNNL-SA--189575

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 265; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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