Creep Resistance of Zr-Sn-Nb-Fe-Cr Alloy
The creep resistance of one kind of Zirconium based alloy with Niobium, Iron, Chromium , Tin alloying elements was investigated, the creep curve ( e-t) was obtained in stress levels of 117MPa 、137MPa、157MPa respectively by holding 200 hours at 400°C. The results show that the creep resistance of this alloy is much better than that of Zircaloy-4. The microstructure of post- creep test was observed by TEM, which shows that the dislocation morphology is changed from dislocation lines to dislocation cells with strain increasing , and some precipitates grow larger. It is concluded that the creep is controlled by dislocation climb-glide diffusion mechanism.
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Z. Li et al., "Creep Resistance of Zr-Sn-Nb-Fe-Cr Alloy", Materials Science Forum, Vols. 475-479, pp. 1405-1408, 2005