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Title: THE EFFECT OF POST-IRRADATION ANNEALING ON STACKING FAULT TETRAHEDRA IN NEUTRON-IRRADIATED OFHC COPPER

Two irradiation experiments have been completed wherein two sets of tensile specimens of OFHC copper were irradiated with fission neutrons, one set at 200 degrees C and the other at 250 degrees C. Post-irradiation annealing in vacuum was then used to evaluate the change in the defect microstructure, including vacancy-type SFT, voids, and dislocation loops. Individual samples within each set were given one annealing exposure at 300, 350, 400, 450, 500, or 550 degrees C for 2 hours. The fine-scale defect microstructure was characterized by transmission electron microscopy (TEM) to compare the defect size and spatial distribution at each annealing temperature and reference the results to that measured in the as-irradiated condition. Based on the change in the SFT size distributions, post-irradiation annealing led to a preferential removal of the smaller sized SFT, but did not lead to a general coarsening as might be expected from an Oswald ripening scenario. The issue of whether the SFT produced during irradiation are all structurally perfect is still being investigated at the time of this report, however, the images of the SFT appeared more perfect after annealing at 300 degrees C and higher. Further analysis is being performed to determine whether intermediate stagesmore » of SFT formation exist in the as-irradiated condition.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
903273
Report Number(s):
PNNL-SA-39600
AT6020100; TRN: US0703145
DOE Contract Number:
AC05-76RL01830
Resource Type:
Book
Resource Relation:
Related Information: Fusion Materials: Semiannual Progress Report for Period ending June 30, 2003, 34:85-92
Publisher:
Ron Klueh and Renetta Godfrey; DOE Office of Fusion Energy Sciences, Washington, DC, United States(US).
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANNEALING; COPPER; DEFECTS; DISLOCATIONS; FISSION NEUTRONS; IRRADIATION; MICROSTRUCTURE; REMOVAL; RIPENING; SPATIAL DISTRIBUTION; STACKING FAULTS; TRANSMISSION ELECTRON MICROSCOPY corrected pub info, book title, added editors, url, 05/02/2007 - mfl