where 𝑔(𝑇, 𝛔, 𝑥) and 𝑔(𝑇, 0, 𝑥) represent the Gibbs free energy of each phase under stress and without stress, respec-vely. The second and third terms on the right-hand side denote the contribu-on of stress, where Sijkl is the elas-c compliance and σ is the stress tensor. Assuming Vegard's law, the chemo-mechanical strain of each phase is expressed as follows: