Al and Re interdiffusion in the γ-phase of Ni-Al-Re system

Abstract

The activation enthalpies and frequency factors for interdiffussion of Al and Re in the γ-phase of Ni-Al-Re ternary system were estimated by a series of experiments using diffusion couples in the temperature range from 1200 to 1300°C. The method developed by Whittle and Green was applied to obtain the interdiffusion coefficients of the solutes (Al, Re) in the system. The activation enthalpies Q and the frequency factors D̃ o obtained from the experiments confirmed the slower diffusion of Re than Al. In addition, it was found that the influence of Re on the diffusion of Al in the γ-phase or Ni-Al-Re system was insignificant. © 2006 The Japan Institute of Metals.