Paper Title:
Kinetics of Lamellar Decomposition Reactions in U-Nb Alloys
  Abstract

Discontinuous precipitation (DP) and discontinuous coarsening (DC) reactions have been observed in numerous alloy systems [1]. DP has been observed in the U-Nb system [2, 3, 4, 5]. The U-Nb phase diagram (Fig. 1) exhibits a continuous γ-BCC solid solution at high temperatures and a two-phase mixture of a-orthorhombic and γ-BCC below the 647°C monotectoid isotherm. The DP reaction occurs during continuous cooling and isothermal aging over 300-647°C. No metallographic evidence of a DC reaction in U-Nb has been published, although this is suggested from x-ray observations of distinct changes in the Nb content of the γ phase upon prolonged holding after the DP reaction [2, 3, 6]. This study will provide direct evidence for a DC reaction. Discontinuous and other aging reactions [7] are undesirable in U-Nb alloys, since they degrade corrosion resistance [5], ductility [8], and the shape-memory effect [9]. Hence, an improved understanding of the kinetics of these discontinuous phase transformations in U-Nb alloys is of practical interest.

  Info
Periodical
Solid State Phenomena (Volumes 172-174)
Edited by
Yves Bréchet, Emmanuel Clouet, Alexis Deschamps, Alphonse Finel and Frédéric Soisson
Pages
555-560
DOI
10.4028/www.scientific.net/SSP.172-174.555
Citation
R. E. Hackenberg, H. M. Volz, P. A. Papin, A. M. Kelly, R. T. Forsyth, T. J. Tucker, K. D. Clarke, "Kinetics of Lamellar Decomposition Reactions in U-Nb Alloys", Solid State Phenomena, Vols. 172-174, pp. 555-560, 2011
Online since
June 2011
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Price
$32.00
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