The effect of Mo upon radiation damage in Zr-1Nb-1Sn-0.1Fe alloy was studied in situ by using a 1MeV electron microscope which was equipped with a heating device. It was found that, regardless of the Mo content, the nucleation rate and growth rate of the radiation defects increased with irradiation temperature. The addition of 0.5%Mo decreased the initial nucleation rate and suppressed the growth rate of radiation defects at 300C. Extended annealing at 650C further increased the radiation resistance of the Mo-containing alloy.

Effect of Molybdenum on Electron Radiation Damage of Zr-Based Alloys. J.H.Lee, S.K.Hwang, K.Yasuda, C.Kinoshita: Journal of Nuclear Materials, 2001, 289[3], 334–7