Diffusion data at 950C were estimated as function of concentration in the multi-component β-NiAl phase grown in a Ni-based superalloy by using the pack-aluminizing technique. The calculated interdiffusion coefficients were observed to be concentration-dependent within the examined composition range (figure 3). The interdiffusion coefficients of Al and Ni in the multi-component β-NiAl phase was clearly less than reported data. It was suggested that variations in the thermodynamic properties and the structural factor, due to solid-solution of the alloying elements, might be responsible for the decrease in the interdiffusion coefficients of Al and Ni in the multi-component β-NiAl phase.

Study on Diffusion in the Multicomponent β-NiAl Phase. H.Wei, G.C.Hou, Q.Zheng, X.F.Sun, X.D.Yao, H.R.Guan, Z.Q.Hu: Journal of Physics - Conference Series, 2008, 96[1], 012183 (6pp)

Figure 3

Interdiffusion in NiAl