9.1 Freezing Point Depression(1) S.J.T.0. Phase Transformation and Applications Page 14/36 A=A Liquid w- Tm (melting temperature) T Solid AG=RT In al.pure if as.pure =1 AG=0 at T,two phasesinequilibrium al pure =1 Fig.9.1 Phase diagram of a single- component system. SJTU Thermodynamics of Materials Fall 2011 ©X.J.Jin Lecture 14 Phase diagram IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2011 © X. J. Jin Lecture 14 Phase diagram I Page 14/36 9.1 Freezing Point Depression (1) T Liquid Tm (melting temperature) Solid Fig. 9.1 Phase diagram of a single￾component system. As = Al ⎟⎟⎠⎞ ⎜⎜⎝⎛ Δ = = s pure l pure sl aa RT ff G RT ,, ln ln ln 1 ΔG = RT al, pure if as, pure = ΔG = 0 atTm ,two phasesin equilibrium 1 al, pure =