Lecture15

# Lecture15 - Chapter 9 Phase Diagrams ISSUES TO ADDRESS When...

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Chapter 9 - 1 ISSUES TO ADDRESS. .. When we combine two elements. .. what equilibrium state do we get? In particular, if we specify. .. --a composition (e.g., wt% Cu - wt% Ni), and --a temperature ( T ) then. .. How many phases do we get? What is the composition of each phase? How much of each phase do we get? Chapter 9: Phase Diagrams Phase B Phase A Nickel atom Copper atom

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Chapter 9 - 2 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., and ). Aluminum- Copper Alloy Components and Phases (darker phase) (lighter phase) Adapted from chapter-opening photograph, Chapter 9, Callister 3e.
Chapter 9 - 3 A phase diagram - graphical representation of the combinations of temperature, pressure, composition, or other variables for which specific phases exist at equilibrium.

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Chapter 9 - 4 Phase Equilibria: Solubility Limit Introduction – Solutions – solid solutions, single phase – Mixtures – more than one phase Solubility Limit : Max concentration for which only a single phase solution occurs. Question: What is the solubility limit at 20 C ? Answer: 65 wt% sugar . If C o < 65 wt% sugar: syrup If C o > 65 wt% sugar: syrup + sugar. 65 Sucrose/Water Phase Diagram Pure Sugar Temperature (°C) 0 20 40 60 80 100 C o =Composition (wt% sugar) L (liquid solution i.e., syrup) Solubility Limit L (liquid) + S (solid sugar) 20 40 60 80 100 Water Adapted from Fig. 9.1, Callister 7e.
Chapter 9 - 5 Effect of T C o ) Changing T can change # of phases:

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Lecture15 - Chapter 9 Phase Diagrams ISSUES TO ADDRESS When...

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