STP824

    Characteristics of Hydrostatically Extruded Zr-2.5Nb Alloy

    Published: Jan 1984


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    Abstract

    Hydrostatic extrusion is a new production technology. Zr-2.5Nb alloy tubes cold hydrostatically extruded possess excellent mechanical properties similar to heat-treated tubes and better than cold-worked tubes. Examination by transmission electron microscope shows that the alloy is of a uniform cell substructure containing the (α + β) phases, which is one of important factors improving properties of the alloy.

    The study of texture, stress, and reorientation of the hydride shows that hydrostatically extruded tubes with basal plane normals in the radial direction have obviously higher hydride reorientation threshold stress than tubes with basal plane normals in the circumferential direction.

    Moreover, investigation of fracture toughness reveals that hydride distributed perpendicular to the crack propagation direction restrains further propagation of the crack. It is favorable for preserving the fracture resistance of the material.

    Keywords:

    hydrostatic extrusion, zirconium alloy, cell substructure, hydride reorientation, texture, threshold stress, fracture toughness


    Author Information:

    Jie, Z
    General Research Institute for Non-ferrous Metal, MMI, Beijing,

    Zhenhe, L
    General Research Institute for Non-ferrous Metal, MMI, Beijing,

    Wenxian, H
    General Research Institute for Non-ferrous Metal, MMI, Beijing,

    Yunxia, Z
    General Research Institute for Non-ferrous Metal, MMI, Beijing,

    Jiaqi, D
    General Research Institute for Non-ferrous Metal, MMI, Beijing,

    Yan, L
    General Research Institute for Non-ferrous Metal, MMI, Beijing,

    Tieqi, Y
    General Research Institute for Non-ferrous Metal, MMI, Beijing,


    Paper ID: STP34463S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP34463S


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