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Self-diffusion and impurity diffusion of hydrogen, oxygen, sulphur and phosphorus in copper
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
2014 (Swedish)Report (Refereed)
Abstract [sv]

A study on the mobility of hydrogen, oxygen, sulphur, and phosphorus in copper has been made. In addition, the self-diffusion of copper has also been studied. Literature data has been reviewed, and used to evaluate the temperature expressions of the diffusion coefficients of these elements in copper. The interstitial elements oxygen and hydrogen have been described by a single temperature expression in the whole temperature range, whereas the substitutional elements copper, sulphur, and phosphorus have been modelled according to lattice diffusion at high temperatures and grain boundary diffusion at low temperatures. Sulphur, phosphorus, and copper are believed to be nearly immobile within the crystalline grains at low temperature, even for time periods up to 100 000 years. On the other hand, in the grain boundaries these elements can diffuse a typical distance of 5 cm at the same conditions, determined as an upper limit in diffusion distance. Oxygen is more mobile, and can diffuse 1 mm for 10 000 years. However, since both oxygen and sulphur have a very low solubility any measureable mass transport of these elements will never take place at low temperatures. They will instead form oxides and sulphides in the material. Hydrogen is a mobile element, and will be able to diffuse through 5 cm of copper during a time period of 1000 years at room temperature. The diffusion of hydrogen in copper is experimentally well studied down to room temperature. By combining the evaluated hydrogen diffusion coefficient with the thermodynamically calculated hydrogen content in solid solution the permeability of hydrogen can be explained. This can be used to explain the mass-transport of hydrogen for different times, temperatures, and hydrogen activities (pressures).

Place, publisher, year, edition, pages
Swerea KIMAB AB , 2014.
Series
Rapport / Institutet för metallforskning, ISSN 1403-848X ; KIMAB-2014-117
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13018OAI: oai:DiVA.org:ri-13018DiVA, id: diva2:973212
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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