Diffusion of 114mIn in NiAl

First-principles investigation of migration barriers and point defect complexes in B2–NiAl

“…Measured interdiffusion coefficients and self-diffusion coefficients in B2-NiAl show a strong dependence on alloy concentration, exhibiting a minimum around the NiAl stoichiometry [6,7,16,22,45]. This dependence on concentration is undoubtedly due to a variation in the equilibrium concentration of the different point defects and defect clusters that mediate atomic diffusion.…”

The Physical and Mechanical Metallurgy of NiAl

“…Unfortunately, no new experimental data have been generated for a number of years. Additional work is required to determine the activation energy and mechanisms of diffusion at lower temperatures because almost no data exist for diffusion in NIAI below 1200 K. From previous studies (Hancock and McDonnell 1971;Lutze-Birk and Jacobi 1975;Berkowitz, Jaumot, and Nix 1954), it appears that the activation energy for diffusion is a maximum at Ni-50AI, consistent with the diffusion coefficient minima at the same composition. Although there is considerable scatter among the various diffusion studies, critical analysis of the available data for NiAI indicates that the most likely range for QD is on the order of 250 to 300 kJ/mol.…”

On diffusion in the β-NiAl phase

“…Measuring the Al tracer diffusivities was not possible because of a lack of suitable Al isotopes. Minamino et al [12] and Lutze-Brik and Jacobi [13] measured In tracer diffusivities in this phase hoping that In may have more or less the same diffusivity as Al, as both belong to same group in the periodic table and have similar atom sizes.…”