L m& BA B GA-GK m哈 m唱 a+B 「吸=咀 (T=T) 相变点 ug=u G (B) Q ② ① 公切线 温度 A 磴 唱 B (a)单元系(A) b)二元系(A-B) 图4.1单元系和二元系的两相平衡条件 (a)单元系中自由能的交叉点是平衡温度；(b)二元系中公切线的切点 ①和②是平衡成分 T.Nishizawa SJTU Thermodynamics of Materials Spring 2008 ©X.J.Jin Lecture 17 Phase Diagram IllPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 17 Phase Diagram III Page 5/40 T. Nishizawa