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.
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