Creep Behavior of Zr-1.5Nb-0.4Sn-0.1Fe-0.1Cu Alloy
Creep behavior of the Zr-1.5Nb-0.4Sn-0.1Fe-0.1Cu alloy sheet is investigated from 300° C to 400° C in the stress range from 50 MPa to 180 MPa along the rolling direction. The measured strain rates range from 8.8 × 10−10 s−1 to 4.7 × 10−7 s−1. The activation energies are estimated to assess the creep deformation mechanisms in this alloy. The strain rate is slightly different at low stress, while it shows a distinct difference at high stresses. Stress exponents of this alloy increase with increasing applied stress at all testing temperatures. It is concluded that the creep deformation of the Zr-1.5Nb-0.4Sn-0.1Fe-0.1Cu alloy is controlled by the diffusion creep at low stress region and by the climbing of dislocations at high stress region.
Key Wordscreep zirconium alloy nuclear cladding
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