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Theoretical Investigation of The Defect Interactions in Dilute Copper Alloys Intended for Nuclear Waste Containers

Published online by Cambridge University Press:  10 February 2011

P. A. Korzhavyi ,
I. A. Abriikosov  and
B. Johansson
P. A. Korzhavyi
Affiliation:
Condensed Matter Theory Group, Physics Department, Uppsala University S-75121 Uppsala, Sweden
I. A. Abriikosov
Affiliation:
Condensed Matter Theory Group, Physics Department, Uppsala University S-75121 Uppsala, Sweden
B. Johansson
Affiliation:
Condensed Matter Theory Group, Physics Department, Uppsala University S-75121 Uppsala, Sweden
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Abstract

Application of pure, oxygen-free copper as a construction material having excllent corrosion resistance is limited because of the effect of intergranular emnibrittleinent at temperatures above 100–150°C. Dilute copper alloys containing S, P, and Ag inpirities and vacancies are studied theoretically on the basis of total energy calculations. The dissolution energies, volunie misfits, and defect interaction energies are calculated and used to study the microscopic miechanisin behind the effect of these impurities on the eiibrittlenieiit of colpper at interinedia temiperatures. A large linding energy of a sulfur-vacancy defect pair (–0.46 eV) is found. The sulfur-vacancy and sulftir-sulftir interactions in the copper matrix seeni to favor precipitation of copper sulphide Cu2S which is the most probable cause of the einhrittleiieiit. The effect of phosphorus and silver ilmpurities on the einbrittlement of sulfiir-contaminated copper can he related to their competition with sulfuir to attract to vacancies as well as to other lattice defects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 895
Copyright
Copyright © Materials Research Society 1999

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