The effective interdiffusion coefficient of Zn in commercial alloys was determined at 773 to 883K, under pressures ranging from 0 to 0.41GPa. From the temperature dependence of the effective interdiffusion coefficients, the activation energies for the 701, 703 and 705 alloys were deduced to be 125, 124 and 127kJ/mol, respectively, while the associated pre-exponential factors were equal to 3.0 x 10-5, 4.0 x 10-5 and 3.9 x 10-5m2/s. The activation volumes for Zn diffusion were 8.30 x 10-6 and 8.60 x 10-6m3/mol at 823 and 883K, respectively. The ratios of activation volume to molar volume for Al were equal to 0.83 at 823K and 0.86 at 883K. This indicated that the diffusion of Zn occurred mainly via the monovacancy mechanism at 823 and 883K.

Diffusion of Zinc in Commercial Al-Zn Alloys under High Pressure. K.Hisayuki, T.Yamane, T.Takahashi, Y.Minamino, K.Hirao, H.Araki: Journal of Materials Science, 1999, 34[10], 2449-54