Abstract
The concentrations of Sn on the rolling surface (SN), the perpendicular to transversal direction surface (ST) and the perpendicular to rolling direction surface (SR) of Zircaloy-4 (Zr−Sn alloy) and B alloy (Zr−Sn−Nb alloy) specimens which possess similar texture structure were determined by X-ray photoelectron spectroscopy (XPS) at room temperature, 773 and 873K, respectively. The results show that surface segregation of Sn on surfaces of Zircaloy-4 specimens at 773, 873K and B alloy specimens at 873K is anisotropic due to the difference of surface energy among SN, ST and SR surfaces. The level of Sn surface segregation for B alloy specimens is much higher than that for Zircaloy-4 specimens at 873K although the Sn content of B alloy is lower than Zircaloy-4. It is suggested that the surface segregation of Sn is enhanced by Nb in α-Zr matrix. And that is verified by the results of the heat of mixing of Zr53Sn1 and Zr52Sn1Nb1 models calculated by density functional theory (DFT).
Published Version
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