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PHASE DIAGRAMS

PHASE DIAGRAMS - Phase Diagrams Chapter 9 So far We have...

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Phase Diagrams Chapter 9
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So far…. We have concentrated on the solidificaton of a pure metal. We have looked at strengthening approaches that do not require that we change the composition of the metal. In this chapter we start to examine alloying, and see why alloys are stronger than pure metals
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Let’s Start with a basic question.. What is a phase? Homogeneous in crystal structure and atomic arrangement Same physical and chemical properties A definite interface with its surroundings Mechanically separable
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For example A glass of ice water has two phases Solid water phase Liquid water phase A mixture of salt and pepper has two phases Solid salt Solid pepper
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Solid, Liquid or Gas? We usually think of matter as having 3 phases, but.. It’s possible to have more than one solid phase. For example when iron first freezes it is BCC As it cools it changes to FCC Upon further cooling it changes to BCC
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Phase Diagram A visualization technique to help you see where different phases exist, based on “state variables” Solid Liquid Gas Pressure Temperature
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Binary Isomorphous Phase Diagrams for Metal Alloys T e m p e r a t u r e X Y % Y added Liquid Solid Two Phase
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Phase Diagrams Nomenclature T e m p e r a t u r e X Y % Y added Liquidus Solidus Freezing Range
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Temperature Time Cooling Curve for Simple Alloys Liquid Two Phase Solid
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