Transcription of Chapter 9: Phase Diagrams
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Chapter 9: Phase Diagrams
Chapter 9 -1 ISSUES TO When we combine two equilibrium state do we get? In particular, if we composition ( , wt% Cu - wt% Ni), and--a temperature (T) many phases do we get?What is the composition of each Phase ?How much of each Phase do we get? Chapter 9: Phase DiagramsPhase BPhase ANickel atomCopper atomChapter 9 -2 Phase Equilibria: solubility LimitIntroduction Solutions solid solutions, single Phase Mixtures more than one Phase solubility Limit:Max concentration forwhich only a single Phase solution :What is thesolubility limit at 20 C?Answer: 65 wt% Co< 65 wt% sugar:syrupIf Co> 65 wt% sugar:syrup + Phase DiagramPure SugarTemperature ( C)020406080100Co=Composition (wt% sugar)L(liquid solution , syrup) solubility LimitL(liquid) + S(solid sugar)20406080100 Pure WaterAdapted from Fig. , Callister 9 -3 Components:The elements or compounds which are present in the mixture( , Al and Cu) Phases:The physically and chemically distinct material regionsthat result ( , and ).
Rothery rules ) suggesting high mutual solubility. Simple solution system (e.g., Ni-Cu solution) • Ni and Cu are totally miscible in all proportions. Chapter 9 - 8 Unary Systems Single component system Consider 2 metals: Cu has melting T = 1085 oC Ni has melting T = 1453 oC (at standard P = 1 atm) 1085 oC Cu solid liquid T
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