Characteristics of nickel and iron diffusion in molten lead-17lithium alloy

摘要

Diffusion characteristics of transition metals - nickel (Ni) and iron (Fe) diffusion in the molten lead-17lithium (Pb-17Li) were investigated experimentally under the argon atmosphere in the temperature range from 300 degrees C to 600 degrees C by using the long capillary method. The axial concentration distributions of Ni and Fe in Pb-17Li specimens were measured by ICP-MS, and the diffusion coefficients of Ni and Fe were determined based on the Fick's second law. The Arrhenius correlations of diffusion coefficient of Ni and Fe were obtained as D-Ni = 7.37 x 10(-5) exp (-4.66 x 10(3)/RT) (300 degrees C <= T <= 450 degrees C) [cm(2)/s], D-Fe = 321 x 10(-4) exp (-2.64 x 10(4)/RT) (450 degrees C <= T <= 600 degrees C) [cm(2)/s]. It is found that the diffusion coefficient of Ni is one order magnitude bigger than that of Fe in Pb-17Li. The diffusion coefficient of Fe in Pb-17Li was approximately in the same order as that in lead-bismuth eutectic reported by authors. (C) 2015 Elsevier B.V. All rights reserved.