A phenomenological dislocation mobility law for bcc metals

Po, Giacomo; Cui, Yinan; Rivera, David; Cereceda, David; Swinburne, Tom D.; Marian, Jaime; Ghoniem, Nasr

doi:10.1016/j.actamat.2016.08.016

A phenomenological dislocation mobility law for bcc metals

Journal Article · Mon Aug 15 00:00:00 EDT 2016 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.08.016· OSTI ID:1533448

Po, Giacomo ^[1]; Cui, Yinan ^[2]; Rivera, David ^[2]; Cereceda, David ^[3]; Swinburne, Tom D. ^[4]; Marian, Jaime ^[5]; Ghoniem, Nasr ^[6]

Univ. of California, Los Angeles, CA (United States). Mechanical and Aerospace Engineering Dept.; DOE/OSTI
Univ. of California, Los Angeles, CA (United States). Mechanical and Aerospace Engineering Dept.
Johns Hopkins Univ., Baltimore, MD (United States). Hopkins Extreme Materials Inst.; Univ. of California, Los Angeles, CA (United States). Materials Science and Engineering Dept.
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Univ. of California, Los Angeles, CA (United States). Materials Science and Engineering Dept.
Univ. of California, Los Angeles, CA (United States). Mechanical and Aerospace Engineering Dept. Materials Science and Engineering Dept.

Dislocation motion in body centered cubic (bcc) metals displays a number of specific features that result in a strong temperature dependence of the flow stress, and in shear deformation asymmetries relative to the loading direction as well as crystal orientation. Here we develop a generalized dislocation mobility law in bcc metals, and demonstrate its use in discrete Dislocation Dynamics (DD) simulations of plastic flow in tungsten (W) micro pillars. We present the theoretical background for dislocation mobility as a motivating basis for the developed law. Analytical theory, molecular dynamics (MD) simulations, and experimental data are used to construct a general phenomenological description. The usefulness of the mobility law is demonstrated through its application to modeling the plastic deformation of W micro pillars. The model is consistent with experimental observations of temperature and orientation dependence of the flow stress and the corresponding dislocation microstructure.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-03ER54708

OSTI ID:: 1533448

Alternate ID(s):: OSTI ID: 1358717
OSTI ID: 22643456

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 119; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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