Stress effects on the energy barrier and mechanisms of cross-slip in FCC nickel

Kuykendall, William P.; Wang, Yifan; Cai, Wei

doi:10.1016/j.jmps.2020.104105

Stress effects on the energy barrier and mechanisms of cross-slip in FCC nickel

Journal Article · Wed Aug 05 00:00:00 EDT 2020 · Journal of the Mechanics and Physics of Solids

DOI:https://doi.org/10.1016/j.jmps.2020.104105· OSTI ID:1851374

Kuykendall, William P. ^[1]; Wang, Yifan ^[2]; Cai, Wei ^[2]

Stanford Univ., CA (United States). Dept. of Mechanical Engineering; OSTI
Stanford Univ., CA (United States). Dept. of Mechanical Engineering

The energy barrier for homogeneous cross-slip of a screw dislocation in face-centered cubic (FCC) nickel is calculated using atomistic simulations as a function of the Escaig stress on the glide plane, the Escaig stress on the cross-slip plane, and the Schmid stress on the cross-slip plane. Two cross-slip mechanisms, Friedel-Escaig (FE) and Fleischer, are examined and their energy barriers are calculated for a large number of stress combinations. For each mechanism, the energy barrier as a function of three stress components can be reduced into a one-dimensional function of an effective stress. The stress domains in which FE and Fleischer mechanisms operate respectively are determined. Additionally, the FE mechanism dominates when the Escaig stress on the glide plane (in the direction that reduces the stacking fault width) is the largest stress component. Increasing the Schmid stress and Escaig stress (in the direction that expands the stacking fault width) on the cross slip plane promotes the Fleischer mechanism. The cross slip energy barrier functions obtained here can be used as input functions for computing cross slip rates in mesoscale dislocation dynamics simulations.

View Accepted Manuscript (DOE)

Research Organization:: Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0010412

OSTI ID:: 1851374

Alternate ID(s):: OSTI ID: 1810947

Journal Information:: Journal of the Mechanics and Physics of Solids, Journal Name: Journal of the Mechanics and Physics of Solids Journal Issue: C Vol. 144; ISSN 0022-5096

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
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Stress effects on the energy barrier and mechanisms of cross-slip in FCC nickel

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