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The role of Fe on the solubility of Nb in α-Zr by O.T. Woo; M. Griffiths is a Materials Science article available to read on EtoBox.

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The solid solubility of Nb in a-Zr is an important parameter that has a potential impact on the corrosion properties of Zr-Nb alloys at reactor operating temperatures, i.e. below the monotectoid temperature. Work on dilute Zr-Nb alloys has shown that Fe is a common impurity that confounds the assessment of the solid solubility limit for Nb in Zr. This is because Fe has a very low solubility limit and it forms precipitates with both Nb and Zr. To assess the effect of Fe on the phases formed in the binary Zr-Nb alloy system, alloys containing 0.1-0.7 wt% Nb and <11 to 470 wt ppm Fe were heat-treated at temperatures between 575 °C and 600 °C and examined by transmission electron microscopy. Results indicate that, even at a concentration 6 24 ppm, Fe readily combines with Nb to form precipitates in the alloys with Nb contents in the range of 0.20-0.29 wt%. However, b-Nb particles were not observed for these same alloys and were only seen when the Nb content was P 0.49 wt%. Because b-Nb particles were not found in the 0.29 wt% Nb alloy and the precipitation was estimated to have a negligible effect on the amount of Nb remaining in solution (reduced by <0.001 wt%), it is proposed that th

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Author

O.T. Woo; M. Griffiths

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-3115)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)