The anisotropic behavior of Al in hcp Mg was investigated using the couple technique and monocrystalline Mg at 638 to 693K. The coefficients derived from Al profiles in single crystals of Mg were given by:

D⊥(a-axis)(m2/s) = 3.1 x 10-3exp[-152154/RT]

D∥(c-axis)(m2/s) = 8.7 x 10-3exp[-159221/RT]

The diffusion coefficient of Al within the basal plane was some 1.3 times greater than that along the normal to the basal plane.

S.K.Das, Y.M.Kim, T.K.Ha, R.Gauvin, I.H.Jung: Metallurgical and Materials Transactions A, 2013, 44[6], 2539-47