TY - JOUR
T1 - Effect of ion irradiation-produced defects on the mobility of dislocations in 304 stainless steel
AU - Briceño, M.
AU - Fenske, J.
AU - Dadfarnia, M.
AU - Sofronis, P.
AU - Robertson, I. M.
N1 - Funding Information:
This work was supported by the US Department of Energy, Office of Basic Energy Sciences under Contract No. DE-FG02-08ER46525. The authors thank Grace Liu and Josh Kacher for the images presented in Fig. 1 and Dr. M.A. Kirk for his assistance, support and for many fruitful discussions. The authors would like to acknowledge the use of the IVEM-accelerator facility at Argonne National Laboratory. This document was prepared by the University of Illinois at Urbana-Champaign as a result of the use of facilities of the US Department of Energy (DOE), which are managed by UChicago Argonne, LLC, acting under Contract No. DE-AC02-06CH11357. Neither UChicago Argonne, DOE, the US Government, nor any person acting on their behalf: (a) make any warranty or representation, express or implied, with respect to the information contained in this document; or (b) assume any liabilities with respect to the use of, or damages resulting from the use of any information contained in the document.
PY - 2011/2/1
Y1 - 2011/2/1
N2 - The impact of heavy-ion produced defects on the mobility of dislocations, dislocation sources and newly generated dislocations in 304 stainless steel are discovered by performing irradiation and deformation experiments in real time in the transmission electron microscope. Dislocations mobile prior to the irradiation are effectively locked in position by the irradiation, but the irradiation has no discernible impact on the ability of a source to generate dislocations. The motion and mobility of a dislocation is altered by the irradiation. It becomes irregular and jerky and the mobility increases slowly with time as the radiation-produced defects are annihilated locally. Channels created by dislocations ejected from grain boundary dislocation sources were found to have a natural width, as the emission sites within the boundary were spaced close together. Finally, the distribution of dislocations, basically, an inverse dislocation pile-up, within a cleared channel suggests a new mechanism for generating high local levels of stress at grain boundaries. The impact of these observations on the mechanical properties of irradiated materials is discussed briefly.
AB - The impact of heavy-ion produced defects on the mobility of dislocations, dislocation sources and newly generated dislocations in 304 stainless steel are discovered by performing irradiation and deformation experiments in real time in the transmission electron microscope. Dislocations mobile prior to the irradiation are effectively locked in position by the irradiation, but the irradiation has no discernible impact on the ability of a source to generate dislocations. The motion and mobility of a dislocation is altered by the irradiation. It becomes irregular and jerky and the mobility increases slowly with time as the radiation-produced defects are annihilated locally. Channels created by dislocations ejected from grain boundary dislocation sources were found to have a natural width, as the emission sites within the boundary were spaced close together. Finally, the distribution of dislocations, basically, an inverse dislocation pile-up, within a cleared channel suggests a new mechanism for generating high local levels of stress at grain boundaries. The impact of these observations on the mechanical properties of irradiated materials is discussed briefly.
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U2 - 10.1016/j.jnucmat.2010.12.026
DO - 10.1016/j.jnucmat.2010.12.026
M3 - Article
AN - SCOPUS:78751572633
SN - 0022-3115
VL - 409
SP - 18
EP - 26
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1
ER -