ENME382 S2010 0201 ch10 part1

ENME382 S2010 0201 ch10 part1 - Chapter 10: Phase Diagrams...

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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 ) en. .. Chapter 10: Phase Diagrams Chapter 10 - ENME 382 Spring 2010 Section 0201 1 then. How many phases form? What is the composition of each phase? What is the amount of each phase? Phase B Phase A Nickel atom Copper atom
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Phase Equilibria: Solubility Limit Solution – solid, liquid, or gas solutions, single phase Mixture – more than one phase Solubility Limit : Maximum concentration for Sugar/Water Phase Diagram Solubility 100 Adapted from Fig. 10.1, Chapter 10 - ENME 382 Spring 2010 Section 0201 2 Question: What is the solubility limit for sugar in water at 20°C ? Answer: 65 wt% sugar . At 20°C, if C < 65 wt% sugar: syrup At 20°C, if C > 65 wt% sugar: syrup + sugar 65 which only a single phase solution exists. Sugar Temperature (° C) 0 20 40 60 80 100 C = Composition (wt% sugar) L (liquid solution i.e., syrup) Limit L (liquid) + S (solid sugar) 20 40 60 80 Water
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Components : The elements or compounds which are present in the alloy (e.g., Al and Cu) Phases : The physically and chemically distinct material regions that form (e.g., α and β ). Components and Phases Chapter 10 - ENME 382 Spring 2010 Section 0201 3 Aluminum- Copper Alloy α (darker phase) β (lighter phase) Adapted from chapter- opening photograph, Chapter 9, Callister, Materials Science & Engineering: An Introduction, 3e.
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C) 100 80 L iquid) Altering T can change # of phases: path A to B . • Altering
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ENME382 S2010 0201 ch10 part1 - Chapter 10: Phase Diagrams...

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