fig2
![Development of robust surfaces for harsh service environments from the perspective of phase formation and transformation](https://image.oaes.cc/6fdf97ea-ef8f-4210-ac0b-4962c57383cc/4323.fig.2.jpg)
Figure 2. First-principles and CALPHAD calculated results for Pt-Ir and Pt-Au systems: (A) Pt-Ir equilibrium phase diagram; (B) Pt-Au equilibrium phase diagram; (C) formation enthalpies of fcc-(Pt, Ir) and fcc-(Pt, Au) phases; and (D) surface diffusion activation energy for an atom on Pt-Ir (111) and Pt-Au (111) surfaces. Figure reproduced from Ref.[42] with permission from Springer Nature.