STP955

    Spinodal-like Decomposition and Swelling Induced by Ion Irradiation in Simple Fe-Ni and Fe-Ni-Cr Alloys

    Published: Jan 1987


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    Abstract

    A previously published correlation between the compositional dependence of neutron-induced swelling at high temperatures in Fe-Ni-Cr alloys and the development of compositional micro-oscillations has also been found in this study of swelling induced by 5-MeV Ni+ ion irradiation. The tendency toward decomposition is strongest in the 35 to 45% nickel range and diminishes in the range of 60 to 75% nickel. Chromium appears to play no role other than as a surrogate for iron. The scale of the micro-oscillation appears to be more sensitive to temperature than displacement rate. One consequence of this decomposition is the occasional formation of precipitate phases upon cooling after irradiation. In Fe-35Ni, cellular martensite is found to form after irradiation at 625, 675, and 725°C. In Fe-60Ni-15Cr irradiated at 625°C an ordered phase that may be Ni3(Fe,Cr) is sometimes formed. The fortuitous formation of these phases allows the visualization of the size and spacing of the compositional modulations.

    Keywords:

    Fe-Ni alloys, Fe-Ni-Cr alloys, ion irradiation, compositional micro-oscillations, voids, swelling, spinodal-like decomposition


    Author Information:

    Dodd, RA
    Professor and graduate student, University of Wisconsin, Madison, WI

    Garner, FA
    Fellow scientist, Hanford Engineering Development Laboratory, Richland, WA

    Kai, J-J
    Professor and graduate student, University of Wisconsin, Madison, WI

    Lauritzen, T
    Engineer, General Electric Company, Sunnyvale, CA

    Johnston, WG
    Physicist, General Electric Company, Schenectady, NY


    Paper ID: STP33860S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP33860S


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