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The precipitation behavior of a Zr-2.5 wt pct Nb alloy

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Abstract

The morphology, crystallography, and nature of precipitates in a quenched and aged Zr-2.5 wt pct Nb alloy has been studied by transmission electron microscopy. The needle-shaped matrix precipitates and equiaxed twin boundary nucleated precipitates produced by aging at 500 °C were the equilibrium Nb-rich β2 phase. On aging at 600 °C, the matrix precipitation was a mixture of β2 needles and coarse metastable Zr-rich β1 particles, while only β1 particles were found at twin boundaries. The growth direction of the needle-shaped particles, 6.6 deg to 8.2 deg from (1-100)h, and their orientation relationship can be predicted by an invariant line strain model. The β1 precipitates have the Burgers orientation relationship. The formation of metastable β1 and stable β2 particles is considered from the free energy approach of Menon, Banerjee, and Krishnan.

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Authors and Affiliations

  1. Department of Mechanical Engineering II, South China Institute of Technology, Guangzhou, China

    C. P. Luo (Assistant Professor)

  2. Department of Metallurgy and Materials Science, University of Toronto, M5S 1A4, Toronto, ON, Canada

    G. C. Weatherly (Professor)

Authors
  1. C. P. Luo
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  2. G. C. Weatherly
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Luo, C.P., Weatherly, G.C. The precipitation behavior of a Zr-2.5 wt pct Nb alloy. Metall Trans A 19, 1153–1162 (1988). https://doi.org/10.1007/BF02662575

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  • DOI: https://doi.org/10.1007/BF02662575

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