Transmission electron microscopy investigation of Zr_2(Fe,Ni) particles incorporated in the oxide film formed on a Zirconium alloy

摘要

An analytical electron microscopy has been used to investigate the microstructural oxide of Zr_2(Fe,Ni) particles incorporated into the oxide film formed on the alloy ZrSnNbFeCrNi. The alloy has been oxidized in 18.6 MPa lithiated water at 360℃ for 14 days forming an oxide scale of thickness around 1.2 μm. The results indicate: (ⅰ) the oxidation of Zr_2(Fe,Ni) particles is faster than that of Zr(Fe,Cr)_2 particles, accompanied by the diffusion of Fe and Ni out of the Zr_2(Fe,Ni) particles to the surrounding ZrO_2 matrix and; (ⅱ) the oxidation products for Zr_2(Fe,Ni) particles mainly comprise amorphous oxide along with cubic, tetragonal and monoclinic ZrO_2. The behavior of Zr_2(Fe,Ni) particles during oxidation is discussed.