Temperature dependence of invariant diffusion coefficient and activation energy for Fe-Cr-Ni-Co system

Experimental determination of diffusion invariant coefficients in a four-component Fe-Cr-Ni-Co system is conducted for alloys with 16 mas.% of Cr, 13 mas.% of Ni, 2-14 mas.% of Co. Activation energies, corresponding to diffusion invariant coefficients are calculated by the least squares technique. The analysis of concentrational dependences of these coefficients has shown that under a low cobalt content the system can be characterized by the unique activation energy value