The diffusion of 99Mo in the 3 amorphous alloys was measured by using a serial sectioning method, combined with Ar+ ion beam sputtering, at 548 to 648K (table 2). It was found that the diffusion was controlled by 2 diffusion mechanisms, and that the faster one was sensitive to thermal pre-treatments. It was concluded that the slower diffusion mechanism involved volume diffusion in the remainder of the amorphous phase. The faster one was attributed to diffusion in the interface between the crystallites and the remainder of the amorphous phase.

Boundary Diffusion of 99Mo in Annealed Fe76Mo8Cu1B15, Fe40Ni40B20 and Fe80B20 Alloys. J.Čermák, I.Stloukal: Scripta Materialia, 2006, 54[2], 147-52

Table 2

Diffusivity of 99Mo in Fe76Mo8Cu1B15