相图的用处4 S.J.T.0. Phase Transformation and Applications Page 7/34 Weight Percent Cedmium ·求出活度数据 列442℃ 一在两相共存区，某组 分在这两个共存相中 的化学势应相等 (cd) 4an（sln)=as ALomie Percent Cadmium Lp(sIn)=+RTIn am =M+RTIn ap AG=LBx(D)-H(s) T→Tm Solid->liquid AG=△Hm-TASm=△Hm(I- T SJTU Thermodynamics of Materials Fall 2011 ©X.J.Jin Lecture 17 Phase Diagram IVPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2011 © X. J. Jin Lecture 17 Phase Diagram IV Page 7/34 相图的用处 4 • 求出活度数据 – 在两相共存区，某组 分在这两个共存相中 的化学势应相等 D * ( ) ( ln) Bi Bi s μ s = μ Bi Bi Bi Bi l Bi (sln) RT ln a RT ln a * ( ) 0 μ = μ + = μ + ΔG = Bi l − Bi s T →Tm * ( ) * μ ( ) μ (1 ) m m m m T T ΔG = ΔH −TΔS = ΔH − Solid -> liquid