Deformation of zirconium irradiated by 4.4 MeV protons at 347 K

Proton irradiation tests have been performed on two cold-worked zirconium specimens using 4.4 MeV protons with controlled displacement damage rates between 1.4 and 6.9 × 10−7 dpa s−1. The specimens had different Fe contents, nominally pure (NP): 64–70 ppm by weight, and ultra-high purity (UP): 3–5 ppm by weight. A stress of 50 MPa was applied during the tests, and the test temperature was 347 K.