Examination of Multicomponent Diffusion Between two Ni-Base Superalloys

Abstract

The interdiffusion at 1293 °C between two multicomponent Ni-base superalloys, René-N4 and Ren6-N5, was assessed by measuring the composition vs. distance curves and by comparing the measured curves to predictions obtained using a diffusion mobility database recently published by Campbell et al. (Acta Mat.50 (2002) 775–792). Although the diffusion database was constructed primarily from binary diffusion data, the extrapolation to the multicomponent systems gave good results in the prediction of the measured composition vs. distance curves. In addition, the location of the Kirkendall porosity on the René-N4 side of the diffusion couple was successfully predicted. This initial success points to the suitability of the general approach to the development of diffusion databases and to the desirability for additional database refinements including possible efforts from the first principles community.