STP956

    Light-Ion Irradiation Creep and Hardening of Model Ferritic Alloys

    Published: Jan 1987


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    Abstract

    Light-ion irradiation creep testing was combined with microhardness testing to study changes in creep strength of two model ferritic alloys. Creep enhancement followed by radiation hardening was observed for both alloys. Post-irradiation creep rates and post-irradiation microhardness data confirm that significant radiation hardening occurred due to the 673 K deuteron bombardment of 0.05 displacements per atom (dpa). Measured rapid creep rates were consistent with a climb-glide creep model developed for pure Ni after dislocation bias factors were reduced by a factor of five to account for the body centered cubic (bcc) structure. This was attributed to the relative insensitivity of climb-glide creep to the interstitial bias, and to the fact that the small dislocation loops were unfaulted in the ferritic alloy but were initially faulted loops in the Ni. Electron microscopy revealed that a high density of small dislocation loops were formed during the irradiation. Microhardness testing results were consistent with irradiation hardening due to dislocation loops, as were the creep results.

    Keywords:

    irradiation creep, dislocation loops, ferritic alloys, microhardness, climb-glide creep, radiation, deuterons, dislocation bias, dislocation glide, dislocation climb, hardening


    Author Information:

    Henager, CH
    Senior research scientists, Pacific Northwest Laboratory, Richland, WA

    Simonen, EP
    Senior research scientists, Pacific Northwest Laboratory, Richland, WA


    Paper ID: STP25641S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP25641S


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