Chapter9-lecture 14

Chapter9-lecture 14 - Chapter 9 Phase Diagrams ISSUES TO...

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ISSUES TO ADDRESS. .. When we combine two elements. .. what equilibrium state do we get? In particular, if we specify. .. --a composition (e.g., wt% Pd - wt% Sn), 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
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Why Study Phase Diagram? Water Quenched (WQ) Furnace Cooled (FC) As Received (AR)
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Why Study Phase Diagram?
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Why Study Phase Diagram? FC AR WQ
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5 Phase and Component Phase: same in chemistry and structure Component: distinct chemical substance Lead rich B -phase (dark layers) Tin rich C -phase (light layers) Pd-Sn solder alloy
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6 Degrees of freedom – # of independent variables Gibbs phase rule – F = C – P + 2 F = C – P + 1 State variables – T, P, and Composition If P=1atm, then
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Phase Diagram Figure 9-5 (mol%) Binary diagrams Ternary diagrams Graphical representation of the state variables associated with microstructures through the Gibbs phase rule F = C – P + 1
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Application of Gibbs Phase Rule F = C – P + 1 Figure 9-7
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Composition of Phases: Figure 9-6 Liquidus Solidus X L X SS Tie line
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Microstructural Characteristics of Various Regions Figure 9-8 L O SS O X SS
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Phase Diagram for Cu-Ni System Figures 9-9 (mol%) (wt%)
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Chapter9-lecture 14 - Chapter 9 Phase Diagrams ISSUES TO...

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