Analytical electron microscopy was used to determine the solute concentration profiles that were left behind the moving reaction front of a discontinuous precipitation reaction in a Ni-4at%Sn alloy. These profiles were converted into grain-boundary diffusivity values by using Cahn's diffusion equation, and data on the growth rate of the discontinuous precipitates. Such a procedure was applied for the first time to the Ni-Sn system, and it provided diffusivity data (table 212) which were very similar to published values for stationary grain boundaries.

P.Zięba, W.Gust: Materials Science Forum, 1999, 294-296, 145-8

Table 208

Chemical Diffusion Parameters for Ni-Re Alloys