Effect of high pressure on react diffusion in Al-Ag system

The react diffusion under pressures of 0–3 GPa has been investigated in the Al-Ag system at temperatures of 729–873 K. The only phase appearing in the diffusion zone under pressures of 0–3 GPa is ς phase. The rate constants of phase growth and the interdiffusion coefficients decrease with increasing pressure. The activation volumes of interdiffusion and phase growth of ς phase are determined to be 7.9 × 10⁻⁶ and 7.0 × 10⁻⁶ m³ mol⁻¹ respectively. These values of activation volume indicate that phase growth is controlled by diffusion occurring by the monovacancy mechanism.