上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY Phase diagrams and Gibbs free energy diagram at certain Tempearture T 8 a+B A B
Phase diagrams and Gibbs free energy diagram at certain Tempearture
上游充通大￥ 160U片 SHANGHAI JIAO TONG UNIVERSITY 1400h 1200外 11186 266.3 10.5 42. B 包 1000 Points: A:Tm of Pt 800 B:Tm of Ag P:Peritectic point。 400LE 3 60 The alloy at D is called peritectic alloy(包晶合金)% >Line:ACB:liquid phase line ADPB:solid phase line DE:solid solution curce of Ag in Pt PF:solid solution curce of Pt in Ag DPC:horizontal,called peritectic line. The alloys on this line is under peritectic reaction:Lc ap →BP Regions:three single phase regione:L、a、B a:solid solution of Ag in Pt B:solid solution of Pt in Ag three double phase regions:L+a、L+B、a+B
A Points：A：Tm of Pt B：Tm of Ag P：Peritectic point。 The alloy at D is called peritectic alloy(包晶合金) Line：ACB：liquid phase line ADPB：solid phase line DE：solid solution curce of Ag in Pt PF： solid solution curce of Pt in Ag DPC：horizontal, called peritectic line. The alloys on this line is under peritectic reaction: LC + αD →βP Regions： three single phase regione： L、α、β α：solid solution of Ag in Pt β：solid solution of Pt in Ag three double phase regions：L+α、L+β、α+β。 B
上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY Usage of phase diagrams 1 ith multi-components syster -phase rule -Phase diagrams: 1.equilibrium phases under different conditions 2.What will happen to the phases while the Temp,pressure and/or composition changes 3.The conditions for phase transformation To investigate new materials Critical evidence to analyze the alloy components,chemical composition, and to design the manufacturing and thermal treatment process
Usage of phase diagrams 1 To deal with multi-components system -phase rule -Phase diagrams: 1.equilibrium phases under different conditions 2.What will happen to the phases while the Temp, pressure and/or composition changes 3.The conditions for phase transformation To investigate new materials Critical evidence to analyze the alloy components, chemical composition, and to design the manufacturing and thermal treatment process
上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY Usage of phase diagrams 2 To purify a material in M 液相 certain region 固溶体 The impurities in the solid is less than in liquids 20B 熔 熔 图5-15区域熔炼示意图
Usage of phase diagrams 2 To purify a material in certain region The impurities in the solid is less than in liquids
上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY Usage of phase diagrams 3 估算热力学数据，如 熔化热 一从相图上查出一定成 分的合金系统中，作 LT-T) 为溶剂的金属熔点降 XB= 低了多少度，然后用 RTR 稀溶液凝固点下降的 依数性公式，即可估 算溶剂金属的摩尔熔 化焓
Usage of phase diagrams 3