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Chapt 11 Binary Phase Diagrams

# Chapt 11 Binary Phase Diagrams - EMA4120 Physical...

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EMA4120 Physical Metallurgy I, Chapt 11 Phase Diagrams University of Florida, Dept. of Materials Science and Engineering EMA4120 Physical Metallurgy I Chapter 11: Binary Phase Diagrams Paul Holloway 202 Rhines Hall 846-3330 [email protected]

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EMA4120 Physical Metallurgy I, Chapt 11 Phase Diagrams University of Florida, Dept. of Materials Science and Engineering Outline Phase Diagrams Binary isomorphous system Lever rule Phase composition in 2 phase region Free energy of phases in equilibrium Ordered alloys Eutectic system Microstructures Phase equilibria Peritectic system Monotectic system Intermediate phases
EMA4120 Physical Metallurgy I, Chapt 11 Phase Diagrams University of Florida, Dept. of Materials Science and Engineering Phase Diagrams Equilibrium diagrams Constitution diagrams Obey the phase rule Simplest is the isomorphous system Continuous solid solution P + F = C + 1 (P = constant) F = C – P + 1

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EMA4120 Physical Metallurgy I, Chapt 11 Phase Diagrams University of Florida, Dept. of Materials Science and Engineering Free Energy of Phases in Equilibrium T=1455C T=1200C P = constant (1 atm)
EMA4120 Physical Metallurgy I, Chapt 11 Phase Diagrams University of Florida, Dept. of Materials Science and Engineering Lever Rule Average alloy composition = 73 wt% Cu; for a tie line at 1200 o C: Fraction of solid at 1200 o C = (n-z)/(n-m) = (78-73)/(78-62) = 0.3124 Fraction of liquid at 1200 o C = (z-m)/(n-m) = (73-62)/(78-62) = 0.6875 Composition of solid = 62 wt% Cu, 38 wt% Ni @1200 o C Composition of liquid = 78 wt% Cu, 22 wt% Ni @1200 o C

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EMA4120 Physical Metallurgy I, Chapt 11 Phase Diagrams University of Florida, Dept. of Materials Science and Engineering Composition of Phases during Heating & Cooling For 70% Cu alloy at T=c, 100% liquid At T = x:
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Chapt 11 Binary Phase Diagrams - EMA4120 Physical...

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