Transient solute drag and strain aging of dislocations

Epperly, E. N.; Sills, R. B.

doi:10.1016/j.actamat.2020.03.031

Transient solute drag and strain aging of dislocations

Journal Article · Mon May 04 00:00:00 EDT 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.03.031· OSTI ID:1619233

Epperly, E. N. ^[1]; ^[2]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States); Rutgers Univ., Piscataway, NJ (United States)

The transient drag force exerted by mobile solutes on a moving dislocation is computed using continuum theory. These mobile solutes form so-called Cottrell atmospheres around dislocations during static and dynamic strain aging. We evaluate the evolution of the drag force exerted by the atmosphere under two velocity time-histories: impulsive acceleration to a chosen velocity and a constant acceleration rate. A particular focus is on the conditions under which the stationary limit assumed by theories of dynamic strain aging is obeyed. According to our results, two conditions—one on the dislocation velocity and one on the acceleration rate—must be satisfied for the stationary limit to hold. Using the Orowan relation and a line tension model, we obtain estimates for the temperature, stress, strain rate, and dislocation density regimes where the stationary limit is valid, and compare these results with experiments for a few material systems.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1619233

Alternate ID(s):: OSTI ID: 1694111

Report Number(s):: SAND--2020-3746J; 685129

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 193; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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