Today s objectives-Diffusion and Phase Diagrams

Jul 11, 2012

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Today s objectives-Diffusion and Phase Diagrams

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1. Today�s objectives-Diffusion and Phase Diagrams

Phase Diagrams

Phase Diagrams. Chapter 10. Chapter 10 (part 1). Introduction Solubility Limits Phases Phase Equilibrium Interpretation of Phase Diagrams Binary Isomorphous Systems (Cu-Ni) Development of Microstructure Mechanical Properties Binary Eutectic Systems

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Today s Objectives

Quiz

807 views • 62 slides

Phase Diagrams

Phase Diagrams. Show the ranges of temperatures (and/or P) and composition over which phases or mixtures of phases of a compound or compounds are stable. Can also show existence of allotropes or polymorphism (solids having same composition, but different structure).

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Phase Diagrams

Phase Diagrams. Phase diagram: plot of pressure vs. Temperature summarizing all equilibria between phases. Given a temperature and pressure, phase diagrams tell us which phase will exist. Features of a phase diagram:

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Phase Diagrams

Phase Diagrams. Critical temperature : temperature above which the vapor can not be liquefied. Critical pressure : pressure required to liquefy AT the critical temperature. Critical point : critical temperature and pressure (water = 374°C and 218 atm ). Phase changes by Name. Water.

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Phase Diagrams

**Phase diagrams have been excluded from the AP course. Phase Diagrams. Critical temperature : temperature above which the vapor can not be liquefied. Critical pressure : pressure required to liquefy AT the critical temperature.

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Phase Diagrams

Phase Diagrams. Your Guide to Stability and Occurrence of Minerals. Pressure-Temperature Diagram: One Component: Water. Pressure-Temperature Diagram: One Component: Silica (SiO2). Temperature-Composition Diagrams: Complete Solid Solution. Temperature-Composition Diagrams: No Solid Solution.

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Phase Diagrams

Phase Diagrams. Best, Chapter 14. Gibbs Phase Rule. F = 2 + C -  F = degrees of freedom (P-T-X) C= components  = phases. Degrees of Freedom. Rule applies to a phase or assemblage Divariant indicates two degrees of freedom Univariant means one degree of freedom

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Today ’ s Objectives

Today ’ s Objectives. TSW be able to recognize and give examples of the three types of symmetry found in animals. TSW be able to properly use directional terms for anatomical position. TSW be able to draw the three types of triploblastic body plans. Symmetry. Asymmetry Radial Symmetry

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Phase Diagrams

By Katie Anderson. Phase Diagrams. Definition. Shows the relationships between the solid liquid, and vapor states. Phase Diagram of Water. Point A- triple point; where all three states are balanced. SP- sublimation point; changes from solid to gas without becoming a liquid.

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PHASE DIAGRAMS

PHASE DIAGRAMS. STUDY OF PHASE RELATIONSHIPS IMPORTANT IN KNOWING PROPERTIES OF MATERIALS MAP OF TEMPERATURE, PRESSURE AND COMPOSITION BETWEEN PHASES IN EQUILIBRIUM IN A SYSTEM GIBBS PHASE RULE P + F = C + 2 Eg: states of matter- gas, liquid and solid – single phase

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Today ’ s Objectives

Today ’ s Objectives. 1. Students can understand one short story by discussion one another, not by the teacher’s translation. 2. Students can cooperate one another through group activities. 3. Students can take part in the class actively. Question 1 Where was he born?

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Phase Diagrams

Phase Diagrams. Reading Phase Diagrams. Describing Phase Diagrams. Phase Boundary (boundary between phases) Triple Point (when three phases co-exist) Critical Point (where the properties of two phases become indistinguishable from each other) Fusion/Melting (s  l)

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Phase Diagrams

Phase Diagrams. A phase is a state of matter with the following characteristics: It has the same structure or atomic arrangement throughout It has roughly the same composition and properties throughout.

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PHASE DIAGRAMS

PHASE DIAGRAMS. Phase B. Phase A. Silver atom. Copper. atom. • When we combine two elements... what equilibrium state do we get?. • In particular, if we specify... --a composition (e.g., wt%Cu - wt%Ag), and --a temperature (T). THE SOLUBILITY LIMIT.

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phase diagrams

phase diagrams. provide a simple, graphical framework for conceptualizing and analyzing semi-quantitatively complex phenomena in natural systems thermodynamically rigorous very large body of knowledge, so we will explore only one important example (not covered in the book).

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Phase Diagrams

Phase Diagrams. A phase diagram is a graphical representation of the conditions of temperature and pressure under which a substance exists as a solid, liquid, a gas, or some combination of these in equilibrium. Generalized Phase Diagram. AD = fusion curve (solid/liquid). Critical point.

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Phase Diagrams

Phase Diagrams. Chapter 11. Chemical Systems. Undergo three main processes that change their energy Chemical reactions Heating/cooling Phase transitions. Phase Diagrams.

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Phase Diagrams

Phase Diagrams. What is Phase?. The term ‘ phase ’ refers to a separate and identifiable state of matter in which a given substance may exist. Applicable to both crystalline and non-crystalline materials

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Phase Diagrams

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Phase Diagrams

melting / production process / alloying (strength, T m ...) heat treatment. material properties. microstructure. system (e.g. Cu-Ni). components (pure substances or compounds). phases (uniform physical/chemical characteristic). solid solution – solvent + solute

264 views • 20 slides

Phase Diagrams

Phase Diagrams. By Anil Kumar Garikapati Assoc. Prof. Dept. of Mech. Engg. Phase Diagrams. Phase B. Phase A. Nickel atom. Copper atom. ISSUES TO ADDRESS. • When we combine two elements... what is the resulting equilibrium state?. • In particular, if we specify...

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