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Hydride Phases, Orientation Relationships, Habit Planes, and Morphologies

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The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Components

Part of the book series: Engineering Materials ((ENG.MAT.))

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Abstract

This chapter deals with the morphology, habits, and orientation relationships of single, or groups of, γ- and δ-hydride precipitates in zirconium and its alloys in stressed and unstressed material. It is shown that individual hydride precipitates have acicular or plate-like shapes, forming offset arrays of precipitates driven through an autocatalytic nucleation process by the hydrides’ transformation strains. In Zr-2.5Nb pressure tube alloys their habit planes are always the near-basal α-zirconium planes regardless of the orientation of the hydride cluster array as it appears in optical micrographs. From analyses of the hydride’s habit plane and its shape and cluster configuration it is concluded that in Zr-2.5Nb pressure tube material hydride formation is via an invariant plane strain transformation in which almost all of the volumetric transformation strain is oriented in the direction normal to the invariant plane.

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Notes

  1. 1.

    Weatherly [46] gives the third diagonal term as 1.0320, which seems to be in error from the dot product of S 2·S 1.

  2. 2.

    The reference for the lattice parameters of γ-hydride given in Carpenter’s paper [11] is incorrectly attributed to Bradbrook et al. [6] (the typographical error in this reference is corrected here). The latter authors actually quote the lattice parameter values for γ-hydride determined by Sidhu et al. [43]. Weatherly [46] also uses Sidhu et al’s lattice parameter values in his transformation strain calculations, citing an open literature version of this source [43].

  3. 3.

    Note the observation of hydrides in the β phase shown in Fig. 3.24. The significance of this is brought out in Chap. 6, dealing with the thermodynamic relationships for the Zr–H solvus.

  4. 4.

    A more detailed study in a heat-treated Zr-2.5Nb alloy of the interface formed between the retained β-Zr(bcc) and the surrounding α-Zr matrix phases has been described in a number of papers [36, 49, 50].

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    Manfred P Puls

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Puls, M.P. (2012). Hydride Phases, Orientation Relationships, Habit Planes, and Morphologies. In: The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Components. Engineering Materials. Springer, London. https://doi.org/10.1007/978-1-4471-4195-2_3

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  • DOI: https://doi.org/10.1007/978-1-4471-4195-2_3

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