51Cr diffusion in Zr-Sn alloys
Creators
- 1. Comision Nacional de Energia Atomica, Buenos Aires (Argentina). Dept. de Materiales
Description
The 51Cr volume diffusion in Zr-Sn alloys is measured in polycrystals with big grains by the thin-film method. The Sn content in the alloys ranges from 0.39% at to 6.66 % at. In the beta-phase the analysed temperature range is 982 deg C-1240 deg C. The Sn dehances the 51Cr diffusion in beta-Zr, the effect being small but well defined. Assuming the formation of Sn-Cr dimers, the linear dehancement coefficient b and the parameters for the variation of b with temperature were calculated. The parameters Q and Do were calculated for the more diluted alloys and, upon application of the Zener theory for Do, a negative contribution to the activation entropy is found. Three experiments at different temperatures were performed in the alpha-phase. 51Cr diffuses very fast in alpha-Zr-Sn. No definite correlation is found between the 51Cr diffusivity and the increasing Sn concentration, probably due to the anisotropy of the alfa-phase. (M.E.L.)
Availability note (English)
MF available from INIS under the Report Number; Also available from Comision Nacional de Energia Atomica, Buenos Aires (AR).Abstract (Spanish)
Se midio el volumen de difusion de 51Cr en aleaciones Zr-Sn en policristales de grano grande por el metodo de pelicula delgada. El contenido de Sn en las aleaciones vario entre 0,39% at. y 6,66% at. En la fase beta el ambito de temperaturas estudiado fue 982 grados C-1240 grados C. El Sn desacelera la difusion de 51Cr en Zr-beta; el efecto es pequeno pero bien definido. Suponiendo la formacion de dimeros Sn-Cr se calcularon el coeficiente de desaceleracion lineal b y los parametros de variacion de b con la temperatura. En las aleaciones mas diluidas se determinaron los parametros Q y Do y se encontro una contribucion negativa a la entropia de activacion al aplicar la teoria de Zener para Do. En fase alfa se analizaron tres ensayos a distintas temperaturas. El 51Cr difunde muy rapidamente en Zr-Sn alfa. No se encontro una correlacion definida entre la difusion de 51Cr y la concentracion creciente de Sn, probablemente a causa de la anisotropia de la fase alfa. (M.E.L.)Files
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Additional details
Additional titles
- Original title (Spanish)
- Difusion de
Publishing Information
- Imprint Pagination
- 39 p.
- Report number
- CNEA-NT--2/82
INIS
- Country of Publication
- Argentina
- Country of Input or Organization
- Argentina
- INIS RN
- 18082174
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ALLOY-ZR98SN-4; CHROMIUM 51; CORROSION PROTECTION; DIFFUSION; TIN ALLOYS; ZIRCONIUM ALLOYS
- Descriptors DEC
- ALLOYS; BETA DECAY RADIOISOTOPES; CHROMIUM ADDITIONS; CHROMIUM ISOTOPES; CORROSION RESISTANT ALLOYS; DAYS LIVING RADIOISOTOPES; ELECTRON CAPTURE RADIOISOTOPES; EVEN-ODD NUCLEI; HEAT RESISTING ALLOYS; INTERMEDIATE MASS NUCLEI; IRON ADDITIONS; ISOTOPES; NUCLEI; RADIOISOTOPES; ZIRCALOY; ZIRCONIUM BASE ALLOYS