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Title: Frank loop formation in irradiated metals in response to applied and internal stresses

Abstract

The Frank loop and dislocation microstructures developed in three face-centered cubic alloys during fast reactor irradiation have been examined to determine the influence of applied and internally-generated stress on loop evolution. It is shown that anisotropic stresses generate a corresponding anisotropy of Frank loop populations on the four close-packed planes. The loop populations thus represent a microstructural record of the irradiation creep processes in action. The ease of interpreting this record depends on the relative magnitudes of external and internal stresses. Metals with low irradiation creep rates which also undergo concurrent and substantial phase changes during irradiation are subject to large and indeterminate levels of internally-generated stress which render the microstructural record uninterpretable with respect to the applied stress state. When the internally-generated stresses are small in comparison to the externally-applied stresses, a clear record of the SIPA (Stress-Induced-Preferential-Absorption) growth mechanism of irradiation creep is imprinted at low neutron fluences in the density and sizes of loops present on each set of close-packed planes. This record fades at higher fluences when the continued anisotropic formation, growth and unfaulting of Frank loops generates a corresponding anisotropy in the resultant free dislocation network, a process which alters the competition of sinks formore » point defects.« less

Authors:
; ;
Publication Date:
Research Org.:
Hanford Engineering Development Lab., Richland, WA (USA)
OSTI Identifier:
5221171
Report Number(s):
HEDL-SA-2002-FP; CONF-800609-12
TRN: 80-013695
DOE Contract Number:  
AC14-76FF02170
Resource Type:
Conference
Resource Relation:
Conference: 10. international symposium on effects of radiation on materials, Savannah, GA, USA, 3 Jun 1980
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; STAINLESS STEEL-316; PHYSICAL RADIATION EFFECTS; ANISOTROPY; CREEP; FAST NEUTRONS; MICROSTRUCTURE; POINT DEFECTS; STRESSES; ALLOYS; BARYONS; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-NICKEL STEELS; CORROSION RESISTANT ALLOYS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; ELEMENTARY PARTICLES; FERMIONS; HADRONS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MECHANICAL PROPERTIES; MOLYBDENUM ALLOYS; NEUTRONS; NICKEL ALLOYS; NUCLEONS; RADIATION EFFECTS; STAINLESS STEELS; STEELS; 360106* - Metals & Alloys- Radiation Effects

Citation Formats

Gelles, D. S., Garner, F. A., and Brager, H. R. Frank loop formation in irradiated metals in response to applied and internal stresses. United States: N. p., 1980. Web.
Gelles, D. S., Garner, F. A., & Brager, H. R. Frank loop formation in irradiated metals in response to applied and internal stresses. United States.
Gelles, D. S., Garner, F. A., and Brager, H. R. Tue . "Frank loop formation in irradiated metals in response to applied and internal stresses". United States. https://www.osti.gov/servlets/purl/5221171.
@article{osti_5221171,
title = {Frank loop formation in irradiated metals in response to applied and internal stresses},
author = {Gelles, D. S. and Garner, F. A. and Brager, H. R.},
abstractNote = {The Frank loop and dislocation microstructures developed in three face-centered cubic alloys during fast reactor irradiation have been examined to determine the influence of applied and internally-generated stress on loop evolution. It is shown that anisotropic stresses generate a corresponding anisotropy of Frank loop populations on the four close-packed planes. The loop populations thus represent a microstructural record of the irradiation creep processes in action. The ease of interpreting this record depends on the relative magnitudes of external and internal stresses. Metals with low irradiation creep rates which also undergo concurrent and substantial phase changes during irradiation are subject to large and indeterminate levels of internally-generated stress which render the microstructural record uninterpretable with respect to the applied stress state. When the internally-generated stresses are small in comparison to the externally-applied stresses, a clear record of the SIPA (Stress-Induced-Preferential-Absorption) growth mechanism of irradiation creep is imprinted at low neutron fluences in the density and sizes of loops present on each set of close-packed planes. This record fades at higher fluences when the continued anisotropic formation, growth and unfaulting of Frank loops generates a corresponding anisotropy in the resultant free dislocation network, a process which alters the competition of sinks for point defects.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {4}
}

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