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 ).
Chapter 9 - 3 • Components : The elements or compounds which are present in the mixture (e.g., Al and Cu) • Phases : The physically and chemically distinct material regions that result (e.g., α and β). Aluminum-Copper Alloy Components and Phases α (darker phase) β (lighter phase) Adapted from chapter-opening photograph, Chapter 9 ...
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