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Title: A phenomenological dislocation mobility law for bcc metals

Journal Article · · Acta Materialia
 [1];  [1];  [1];  [2];  [3];  [4];  [5]
  1. Univ. of California, Los Angeles, CA (United States). Mechanical and Aerospace Engineering Dept.
  2. Johns Hopkins Univ., Baltimore, MD (United States). Hopkins Extreme Materials Inst.; Univ. of California, Los Angeles, CA (United States). Materials Science and Engineering Dept.
  3. Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
  4. Univ. of California, Los Angeles, CA (United States). Materials Science and Engineering Dept.
  5. 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.

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
Journal Information:
Acta Materialia, Vol. 119; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 118 works
Citation information provided by
Web of Science

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Direct prediction of the solute softening-to-hardening transition in W–Re alloys using stochastic simulations of screw dislocation motion journal March 2018
Screw dislocation interaction with irradiation defect-loops in α -iron: evaluation of cross-slip effect using dislocation dynamics simulations journal June 2018
Kink-limited Orowan strengthening explains the brittle to ductile transition of irradiated and unirradiated bcc metals journal July 2018
Diffusion and interaction of prismatic dislocation loops simulated by stochastic discrete dislocation dynamics journal July 2019
Avalanche statistics and the intermittent-to-smooth transition in microplasticity journal August 2019
Dislocation spreading and ductile–to-brittle transition in post-irradiated ferritic grains: Investigation of grain size and grain orientation effect by means of 3D dislocation dynamics simulations journal May 2019
Influence of Size on the Fractal Dimension of Dislocation Microstructure journal April 2019
Atomistic Study of the Role of Defects on α → ϵ Phase Transformations in Iron under Hydrostatic Compression journal September 2019
Avalanches and Plastic Flow in Crystal Plasticity: An Overview text January 2017
Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires journal March 2018