Measurement and modeling of second phase precipitation kinetics in zirconium niobium alloys

Maria Ivermark, Joseph Robson, Michael Preuss

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

2 Citations (Scopus)

Abstract

Commercial zirconium alloys contain second phase particles (SPPs) that are precipitated during processing. These particles not only influence mechanical properties but more crucially also have a profound influence on the corrosion performance. To understand how to control evolution and size distribution of SPPs, it is necessary to know how alloy composition and process variables influence the precipitation kinetics. In this work, a detailed study has been performed of the precipitation kinetics in binary Zr-1 wt % Nb, Zr-2.6 wt % Nb, and ternary variants with added iron and tin. A numerical model has also been developed to predict the precipitation kinetics of β-Nb in niobium containing zirconium alloys. Precipitation has been tracked by synchrotron X-ray diffraction measurement of lattice parameter change in the zirconium matrix as solute is removed into SPPs. The X-ray data has been complemented by thermoelectric power measurements. The combination of these two approaches is shown to be effective in quantifying the overall precipitation kinetics of SPPs. The results confirm previous observations that without prior deformation, precipitation kinetics is very sluggish in the binary Zr-Nb system. Deformation accelerates precipitation, and this effect is much stronger for the 1 wt % Nb alloy than for 2.6 wt % Nb, because the supersaturation is least. Ternary additions also have a profound effect on the overall precipitation kinetics. Iron accelerates the rate of niobium loss from solution, whereas tin additions appear to increase the incubation time for the onset of precipitation of niobium.

Original languageEnglish
Title of host publicationZirconium in the Nuclear Industry
Subtitle of host publication16th International Symposium
PublisherASTM International
Pages150-172
Number of pages23
ISBN (Print)9780803175150
DOIs
Publication statusPublished - 2011
Externally publishedYes
EventInternational Symposium on Zirconium in the Nuclear Industry 2010 - Chengdu, Sinchuan Province, China
Duration: 9 May 201013 May 2010
Conference number: 16th

Publication series

NameASTM Special Technical Publication
Volume1529 STP
ISSN (Print)0066-0558

Conference

ConferenceInternational Symposium on Zirconium in the Nuclear Industry 2010
CountryChina
CityChengdu, Sinchuan Province
Period9/05/1013/05/10

Keywords

  • Modeling
  • Precipitation kinetics
  • Synchrotron X-ray
  • Zirconium alloys

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