The migration of 95Zr was studied at temperatures ranging from 1200 to 1518K (table 347). The diffusion data obeyed the relationship:

D(m2/s) = 1.74 x 10-9exp[-23.77(kcal/mol)/RT]

No appreciable enhancement of 95Zr diffusion rates was observed at Ag contents of up to 1.45at%. At higher concentrations, the diffusivity increased with increasing Ag content. The self-diffusion data were analyzed in terms of the so-called omega-embryo mechanism. The instability temperature decreased with increasing concentration of β-stabilizer.

R.V.Patil: Journal of Nuclear Materials, 1992, 187[3], 197-203

Table 346

Diffusion of Ta in α-Zr