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Title: Strain Hardening and Long-Range Internal Stress in the Localized Deformation of Irradiated Polycrystalline Metals

Abstract

Low-temperature irradiation can significantly harden metallic materials and often results in microscopic strain localization such as dislocation channeling during deformation. In true stress-true strain analyses, however, the strain localization does not significantly affect macroscopic strain-hardening behavior. It was attempted to explain the strain-hardening behavior during strain localization in terms of long-range back stresses. In theoretical modeling the long-range back stress was formulated as a function of the number of residual pileup dislocations at a grain boundary and the number of localized bands formed in a grain. The strain-hardening rates in channel deformation were calculated for ten face-centered cubic (fcc) and body-centered cubic (bcc) metals. A few residual dislocations in each channel could account for the strain-hardening rates as high as those for uniform deformation. It was also shown that the strain-hardening behavior predicted by the long-range back stress model resembled the empirical strain-hardening behaviors, which result from both localized and non-localized deformations. The predicted plastic instability stress was comparable to the tensile test data.

Authors:
 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Flux Isotope Reactor
Sponsoring Org.:
Work for Others (WFO)
OSTI Identifier:
1003392
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 354; Journal Issue: 1-3
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DISLOCATIONS; IRRADIATION; STRAIN HARDENING; STRESSES; MATHEMATICAL MODELS; METALS; BCC LATTICES; FCC LATTICES

Citation Formats

Byun, Thak Sang, and Hashimoto, Naoyuki. Strain Hardening and Long-Range Internal Stress in the Localized Deformation of Irradiated Polycrystalline Metals. United States: N. p., 2006. Web. doi:10.1016/j.jnucmat.2006.02.099.
Byun, Thak Sang, & Hashimoto, Naoyuki. Strain Hardening and Long-Range Internal Stress in the Localized Deformation of Irradiated Polycrystalline Metals. United States. doi:10.1016/j.jnucmat.2006.02.099.
Byun, Thak Sang, and Hashimoto, Naoyuki. Sun . "Strain Hardening and Long-Range Internal Stress in the Localized Deformation of Irradiated Polycrystalline Metals". United States. doi:10.1016/j.jnucmat.2006.02.099.
@article{osti_1003392,
title = {Strain Hardening and Long-Range Internal Stress in the Localized Deformation of Irradiated Polycrystalline Metals},
author = {Byun, Thak Sang and Hashimoto, Naoyuki},
abstractNote = {Low-temperature irradiation can significantly harden metallic materials and often results in microscopic strain localization such as dislocation channeling during deformation. In true stress-true strain analyses, however, the strain localization does not significantly affect macroscopic strain-hardening behavior. It was attempted to explain the strain-hardening behavior during strain localization in terms of long-range back stresses. In theoretical modeling the long-range back stress was formulated as a function of the number of residual pileup dislocations at a grain boundary and the number of localized bands formed in a grain. The strain-hardening rates in channel deformation were calculated for ten face-centered cubic (fcc) and body-centered cubic (bcc) metals. A few residual dislocations in each channel could account for the strain-hardening rates as high as those for uniform deformation. It was also shown that the strain-hardening behavior predicted by the long-range back stress model resembled the empirical strain-hardening behaviors, which result from both localized and non-localized deformations. The predicted plastic instability stress was comparable to the tensile test data.},
doi = {10.1016/j.jnucmat.2006.02.099},
journal = {Journal of Nuclear Materials},
number = 1-3,
volume = 354,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}