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The coefficient of  65 Zn heterodiffusion in the Mg 17 Al 12  intermetallic compound (β-phase) and the eutectic alloy Mg-33.4 wt.% Al was measured in the temperature region 598 – 698 K using serial sectioning and residual activity methods. The diffusion coefficient of  65 Zn in the intermetallic can be written as  Δ  I  = 1.5 × 10 – 2  m 2  s  –1  × exp( – 154.3 kJ mol  –1 / RT ). At temperatures  T  ≥ 648 K, where the mean diffusion path is greater than the mean interlamellar distance in the eutectic, the effective diffusion coefficient  Δ  eff  = 2.7 × 10 – 2  m 2  s  –1  exp(–155.1 kJ mol – 1 /  RT ) was evaluated. At two lower temperatures, the diffusion coefficients  65 Zn in interphase boundaries were estimated:  Δ  b  (623 K) = 1.6 × 10  –12  m 2  τ – 1  and  Δ  b  (598 K) = 4.4 × 10 – 13  m 2  τ –1 . The specific (Mg)/β interfacial energy γ = 140 mJ m – 2  was assessed from measurement of the time dependence of interlamellar distance during isothermal anneal.

Diffusion of 65 Zn in the Mg 17 Al 12 intermetallic compound and in the Mg-33.4 wt.% Al eutectic