Binary System S.J.T.U. Phase Transformation and Applications Page 3/30 Degrees of freedom available in the system(F): F=C-P+1 F=C-P+2 F:the number of system variables that we may freely vary,or arbitrarily fix C:components P:phase C=2 P=1,F=2 单相区 P=2,F=1 平衡线包围的两相区 P=3,F=0 三相平衡线 SJTU Thermodynamics of Materials Spring2o07©X.J.Jin Lecture 16 Phase Diagram llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2007 © X. J. Jin Lecture 16 Phase Diagram II Page 3/30 Binary System Degrees of freedom available in the system (F): F: the number of system variables that we may freely vary, or arbitrarily fix C: components P: phase = − PCF + 2 C = 2 0,3 1,2 2,1 == == = = FP FP FP −= PCF +1 单相区 平衡线包围的两相区 三相平衡线