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    Nickel-Ion Damage in a Precipitation-Hardened Nickel-Aluminum


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    A precipitation-hardened nickel 14 atom percent aluminum alloy has been irradiated with 2.8 MeV 58Ni+ ions at a damage rate of 4.4 × 10-2 displacements per atom (dpa)/s, over a temperature range of 525 to 725 °C (977 to 1337 °F), to a damage level of 20 dpa, and at 625 °C (1157°F) over a dose range of 4 to 125 dpa. The experiment was designed to examine the stability of Ni3Al precipitates as a function of temperature and dose as well as their role in reducing swelling.

    Prior to irradiation, the precipitates were cuboidal in shape with a mean edge length of 400 Å. Ion bombardment to 20 dpa at 725 °C (1337 °F) generated a higher precipitate density with a reduced and highly uniform size of 85 Å. At all other temperatures, the precipitate structures were less well defined and took on a ragged appearance with a wide spread in sizes as small precipitates formed between the original ones. A few scattered voids were formed at the two highest damage levels at 625 °C (1157 °F), but the swelling was negligible.


    radiation, precipitate stability, swelling, radiation effects, nickel aluminum alloy, transmission electron microscopy, nickel-ion bombardment

    Author Information:

    Kirchner, LG
    Ph.D. candidate of the Department of Nuclear Engineering, University of WisconsinNaval Research Laboratory, MadisonWashington, Wis.D.C.

    Smidt, FA
    Naval Research Laboratory, Washington, D.C.

    Kulcinski, GL
    Professor, The University of Wisconsin, Madison, Wis.

    Sprague, JA
    Naval Research Laboratory, Washington, D.C.

    Westmoreland, JE
    Naval Research Laboratory, Wash., D.C.

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP38060S