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Table 2 Equilibrium values calculated at 453 K and 101 kPa with the nominal composition given in Table 1. The Al matrix and the precipitate β″ were considered as the only active phases

From: Mixed-mode growth of a multicomponent precipitate in the quasi-steady state regime

Molar fraction of Mg in the precipitate: \( {\boldsymbol{c}}_{\boldsymbol{\beta}, \boldsymbol{Mg}}^{\ast} \) 0.4545
Molar fraction of Si in the precipitate: \( {\boldsymbol{c}}_{\boldsymbol{\beta}, \boldsymbol{Si}}^{\ast} \) 0.5105
Molar fraction of Al in the precipitate: \( {\boldsymbol{c}}_{\boldsymbol{\beta}, \boldsymbol{Al}}^{\ast} \) 0.0350
Molar fraction of Mg in the matrix:\( {\boldsymbol{c}}_{\boldsymbol{eq},\boldsymbol{Mg}}^{\boldsymbol{\infty}} \) 7.06E-5
Molar fraction of Si in the matrix: \( {\boldsymbol{c}}_{\boldsymbol{eq},\boldsymbol{Si}}^{\boldsymbol{\infty}} \) 8.61E-3
Coefficient of diffusion of Mg in the matrix (m2/s) 2.01E-19
Coefficient of diffusion of Si in the matrix (m2/s) 1.35E-19
Molar volume of the precipitate (m3/mol) 1.048E-5