Influence of phosphorus on the creep ductility of copper
2013 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 441, no 1-3, 364-371 p.Article in journal (Refereed) Published
Around 1990 it was discovered that pure copper could have extra low creep ductility in the temperature interval 180-250 degrees C. The material was intended for use in canisters for nuclear waste disposal. Although extra low creep ductility was not observed much below 180 degrees C and the temperature in the canister will never exceed 100 degrees C, it was feared that the creep ductility could reach low values at lower temperatures after long term exposure. If 50 ppm phosphorus was added to the copper the low creep ductility disappeared. A creep cavitation model is presented that can quantitatively describe the cavitation behaviour in uniaxial and multiaxial creep tests as well as the observed creep ductility for copper with and without phosphorus. A so-called double ledge model has been introduced that demonstrates why the nucleation rate of creep cavities is often proportional to the creep rate. The phosphorus agglomerates at the grain boundaries and limits their local deformation and thereby reduces the formation and growth of cavities. This explains why extra low creep ductility does not occur in phosphorus alloyed copper.
Place, publisher, year, edition, pages
2013. Vol. 441, no 1-3, 364-371 p.
High-Temperature Creep, Cavity Nucleation, Intergranular Fracture, Alloys, Interfaces, Cavitation, Magnesium, Growth, Metals, Steels
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-133640DOI: 10.1016/j.jnucmat.2013.06.020ISI: 000325447600047ScopusID: 2-s2.0-84880311552OAI: oai:DiVA.org:kth-133640DiVA: diva2:663336
QC 201311112013-11-112013-11-082013-11-11Bibliographically approved