STP956

    Mechanical Properties at Low and High Strain Rates of PE 16 Alloys Irradiated to 9.2 dpa

    Published: Jan 1987


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    Abstract

    The mechanical properties of nimonic alloy PE 16 are reported, for the strain-rate range 10−3 to 103 s−1, at ambient temperature, 400 and 500°C, on as-received, thermally aged (9864 h in sodium at 500°C), and irradiated to 9.2 dpa materials. Regarding the irradiated material one observes: (1) the effect of irradiation consisted of a marked increase of flow stress ranging between 100 and 30% and a reduction of ductility of about 20% points with respect to the as-received material; (2) decrease of flow stress with increasing strain-rate of small value at ambient temperature while it reaches the value of about 15% at high temperature; (3) dynamic strain aging with serrations along the flow curves at high temperature and low strain-rate.

    The decrease of the flow stress with increasing strain-rate of the irradiated material seems to be caused by (1) the dynamic strain aging that is present at low strain rate and not at high strain rate; (2) the thermal softening caused by the temperature rise during the adiabatic dynamic testing; and (3) the accentuation of the effects of the two preceeding phenomena caused by the damage introduced by irradiation.

    Keywords:

    nimonic alloys, mechanical properties, strain rate, irradiation, Hopkinson's bar, yield stress, ultimate tensile strength, uniform deformation, fracture strain


    Author Information:

    Albertini, C
    Engineers, Commission of the European Communities, Joint Research Centre, Ispra Establishment, Ispra (Va),

    Del Grande, A
    Engineers, Commission of the European Communities, Joint Research Centre, Ispra Establishment, Ispra (Va),

    Montagnani, M
    Engineers, Commission of the European Communities, Joint Research Centre, Ispra Establishment, Ispra (Va),

    Pachera, A
    Engineers, Commission of the European Communities, Joint Research Centre, Ispra Establishment, Ispra (Va),


    Paper ID: STP25648S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP25648S


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