ECE 331 Wi11 lecture 8

ECE 331 Wi11 lecture 8 - Chapter 9: Phase Diagrams ISSUES...

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Chapter 9: Phase Diagrams ISSUES TO ADDRESS. .. When we combine two elements. .. what is the resulting equilibrium state? In particular, if we specify. .. -- the composition (e.g., wt% Cu - wt% Ni), and -- the temperature ( T ) then. .. How many phases form? What is the composition of each phase? What is the amount of each phase? Phase B Phase A Chapter 9 - 1 Nickel atom Copper atom
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Phase Equilibria: Solubility Limit Solution – solid, liquid, or gas solutions, single phase ixture ore than one phase olubility Limit Sugar/Water Phase Diagram Adapted from Fig. 9.1, Callister & Rethwisch 8e. Mixture – more than one phase Solubility Limit : Maximum concentration for which only a single phase olution exists e (ºC) Solubility Limit L iquid) 80 100 Question: What is the solubility limit for sugar in solution exists. mperatur e L (liquid solution i.e., syrup) (liquid) + S olid 40 60 water at 20ºC ? Answer: 65 wt% sugar . t 20º Ci f 65 wt% sugar: yrup 65 Te m 0 20 40 60 80 100 (solid sugar) 20 Chapter 9 - 2 At 20 C, if C < 65 wt% sugar: syrup At 20ºC, if C > 65 wt% sugar: syrup + sugar Suga r C = Composition (wt% sugar) Water
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Components and Phases Components : The elements or compounds which are present in the alloy g Al and Cu) (e.g., Al and Cu) Phases : The physically and chemically distinct material regions at form that form (e.g., α and β ). Aluminum- opper β (lighter Copper Alloy α (darker phase) phase) Adapted from chapter- opening photograph, Chapter 9, Callister, Materials Science & ngineering: An Chapter 9 - 3 Engineering: An Introduction, 3e.
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Effect of Temperature & Composition Altering T can change # of phases: path A to B .
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ECE 331 Wi11 lecture 8 - Chapter 9: Phase Diagrams ISSUES...

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