MSE2001H_7_1 - 1 Chapter 7 Phase Equilibria and Phase...

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1 Chapter 7 Phase Equilibria and hase Diagrams Phase Diagrams Introduction The one-component phase diagram Phase equilibria in a two-component system he eutectic phase diagram The eutectic phase diagram The peritectic phase diagram The monotectic phase diagram Complex diagrams
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2 hase Phase A chemically and structurally homogeneous region of a material A part of a system, physically distinct, macroscopically homogeneous, and of fixed or variable composition. is mechanically separable from the rest of the system. That is, a It is mechanically separable from the rest of the system. That is, a phase is a region within which all the intensive variables vary continuously, whereas at least some of them have discontinuities at the borders between phases. ice water ice + water phases = solid phase + liquid phase Æ 2 phases solid phase liquid phase I want to drink “2-phase system consisting of solid water and liquid water”.
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3 Phase diagram raphical representation of the combination of temperature pressure Graphical representation of the combination of temperature, pressure, composition, or other variables for which specific phases exist at equilibrium. State point: a position on the phase diagram Phase diagram of Water (H 2 O) Phase diagram of Carbon dioxide (CO 2 )
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4 One-Component Phase Diagrams Gibbs Phase Rule for systems in equilibrium water F = C – P + 2 C- Components P- Number of phases F- Degrees of freedom F = 2 F = 1 =2 F = 2 F = 0 F = 2 omponent a chemical species whose concentration in a phase can be Component : a chemical species whose concentration in a phase can be varied independently of the other species’ concentration Number of degrees of freedom in equilibrium is the number of variables (p, T, r composition) that can be independently adjusted without disturbing or composition) that can be independently adjusted without disturbing equilibrium.
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5 xample of One omponent Phase Diagrams Example of One-Component Phase Diagrams iron SiO 2
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6 Two-Component Phase Diagrams emperature Temperature Pressure Composition for materials A and B omposition of one omponent F = 1 T (Composition of one-component system?) or one state point in closed system For one state point in closed system we need three variables (p, T, & X).
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This note was uploaded on 06/29/2009 for the course MSE 2001 taught by Professor Tannebaum during the Spring '08 term at Georgia Institute of Technology.

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MSE2001H_7_1 - 1 Chapter 7 Phase Equilibria and Phase...

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