Contents of Today S.J.T.U. Phase Transformation and Applications Page 1/40 Review previous Spinodal Points Compounds etc. Applications of phase diagrams Conclusion Remarks Examples SJTU Thermodynamics of Materials Spring2008©X.J.Jin Lecture 17 Phase Diagram Ill
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 17 Phase Diagram III Page 1/40 Contents of Today Review previous Spinodal Points Compounds etc. Applications of phase diagrams Conclusion Remarks Examples
Review of Today S.J.T.U. Phase Transformation and Applications Page 2/40 。Immiscibility ·Spinodal Points ·Compounds Summary of Binary Phase Ternary Phases Reaction in Binary Systems ·二元相图构成的规则 SJTU Thermodynamics of Materials Spring2008©X.J.Jin Lecture 17 Phase Diagram Ill
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 17 Phase Diagram III Page 2/40 Review of Today • Immiscibility • Spinodal Points • Compounds • Summary of Binary Phase • Ternary Phases Reaction in Binary Systems • 二元相图构成的规则
Binary System S.J.T.U. Phase Transformation and Applications Page 3/40 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 Spring2008©X.J.Jin Lecture 17 Phase Diagram Ill
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 17 Phase Diagram III Page 3/40 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
S.J.T.U. Phase Transformation and Applications Page 4/40 单元系 二元系 ·F=C-P+2=3-P ·F=C-P+1=3-P ·两相共存F=1 ·两相共存F=1 一给定温度或压力，体 给定温度或压力，体 系就已确定，因为两 系如果要确定，必须 相均为纯物质 给定两相中的组成， 即浓度 一多相平衡条件给出， SJTU Thermodynamics of Materials Spring2008©X.J.Jin Lecture 17 Phase Diagram Ill
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 17 Phase Diagram III Page 4/40 单元系 • F=C-P+2=3-P • 两相共存F=1 – 给定温度或压力，体 系就已确定，因为两 相均为纯物质 二元系 • F=C-P+1=3-P • 两相共存F=1 – 给定温度或压力，体 系如果要确定，必须 给定两相中的组成， 即浓度 – 多相平衡条件给出
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 Ill
Phase 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