Lecture 19- Chapter 9-Phase diagram-2018-3-27(1).pdf

Lecture 19- Chapter 9-Phase diagram-2018-3-27(1).pdf -...

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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% Pb - 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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Figure 9.3 (a) Schematic representation of the one-component phase diagram for H 2 O. (b) A projection of the phase diagram information at 1 atm generates a temperature scale labeled with the familiar transformation temperatures for H 2 O (melting at 0 o C and boiling at 100 o C). Phase: same in chemistry and structure Component: distinct chemical substance
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Solder Gun & Solder Alloy
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4 Phase and Component Phase: same in chemistry and structure Component: distinct chemical substance Lead rich a -phase (dark layers) Tin rich b -phase (light layers) Pb-Sn solder alloy
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Brass Typically 68-72 wt% Cu
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Fe-Fe 3 C Phase Diagram
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7 Degrees of freedom – # of independent variables Gibbs phase rule – F = C – P + 2
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