Papers by Author: J.J. Zhang

Abstract: 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.

Abstract: Research on low cyclic fatigue behaviors of two kinds of Zr-alloy(1#:Zr-1Sn-0.3Nb- 0.3Fe-0.1Cr.2#: Zr-1Sn-1Nb-0.4Fe-)at 400°C,The fractural characterization was investigated by SEM.