Creep crack growth in phosphorus alloyed oxygen free copper
2013 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, Vol. 583, 151-160 p.Article in journal (Refereed) Published
Creep crack growth (CCG) has been studied in phosphorus-alloyed oxygen-free copper (Cu-OFP) at 22, 75, 175, and 215 degrees C with compact tension (CT) specimens. At 175 and 215 degrees C, the cracks grew about 10 mm before final instantaneous failure. In contrast, there was no visible crack growth at 22 and 75 degrees C. Strongly deformed grains were observed adjacent to the cracks at 175 and 215 degrees C. Intergranular creep cavities were found around the cracks. At 22 and 75 degrees C, deformed grains and some cavities as well as microcracks were observed close to the crack tip. A model for crack propagation based on creep damage formation has been formulated to interpret the test results. Rupture criteria based on both creep ductility exhaustion and grain boundary cavitation were taken into account. The contribution from the ductility exhaustion to the creep damage dominated at the lower two test temperatures whereas the contribution from grain boundary cavitation at the higher test temperatures. The model can describe the influence of temperature on the observed creep crack propagation. It can also account for the observed cavitation in a qualitative way.
Place, publisher, year, edition, pages
2013. Vol. 583, 151-160 p.
Creep crack growth, Compact tension, Cavitation, Modelling, Phosphorus-alloyed oxygen-free copper
IdentifiersURN: urn:nbn:se:kth:diva-129434DOI: 10.1016/j.msea.2013.06.046ISI: 000323860500019ScopusID: 2-s2.0-84883547238OAI: oai:DiVA.org:kth-129434DiVA: diva2:652912
QC 201310022013-10-022013-09-302013-10-02Bibliographically approved