STP570

    Effect of Irradiation Parameters on Nickel-Ion Damage in Nickel

    Published: Jan 1975


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    Abstract

    Void and dislocation structures have been studied in high-purity nickel which had been irradiated with 2.8 MeV38 Ni+ ions. The irradiation conditions included specimen temperatures between 325 and 725°C, calculated peak damage densities from 4 to 130 displacements per atom (dpa), and calculated peak displacement rates of 7 × 10-2 dpa/s and 7 × 10-4 dpa/s. For the irradiations at 7 × 10-2 dpa/s, voids were formed in specimens irradiated between 525 and 725°C. The maximum swelling at a damage level of 13 dpa was ΔV/V = 1.2 percent, observed in a specimen irradiated at 625°C. Irradiation of the same material to 13 dpa at 7 × 10-4 dpa/s shifted the void formation temperatures approximately 100°C lower and produced a maximum swelling of 2.3 percent at 550°C. For specimens irradiated at a displacement rate of 7 × 10-2 and a irradiation temperature of 575°C, the material was found to swell at a relatively rapid rate to a value of ΔV/V = 0.9 percent at 13 dpa. Above 13 dpa, the swelling rate was lower, and a value of ΔV/V = 2.2 percent was reached at 130 dpa. The results of analyses of these data by void nucleation and growth models are discussed.

    Keywords:

    radiation, irradiation, voids, swelling, nickel, dislocations, electron microscopy, microstructure, radiation damage simulation, radiation effects, ion irradiation


    Author Information:

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

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

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

    Malmberg, PR
    Naval Research Laboratory, Washington, D. C.


    Paper ID: STP33711S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP33711S


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