Section 4 Phase diagrams

Section 4 Phase diagrams - Section 4 PHASE DIAGRAMS (Smith...

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MATE 210 Section 4 PHASE DIAGRAMS (Smith Chapter 8 - skip 8.6, 8.10-12) How do we predict or design microstructures? Maps of stable phases based on: • alloy composition • temperature (thermal history) ? strength, stiffness & ductility
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MATE 210
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MATE 210 Phase Diagram – Ice Cream Chemical Composition
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MATE 210 solubility limit - maximum concentration of solute (sugar) that can be dissolved into solvent (water) to form a solution Iced Tea: Sugar-Water System phase - homogeneous portion of system (e.g., sweetened ice tea) same physical and chemical characteristics usually boundaries between phases sweetened ice tea 1 phase sugar on bottom of glass 2 phases
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MATE 210 What happens when you mix two different metals together? Single Phase (isomorphous): • homogeneous, uniform mixture • same composition throughout • same crystal structure Binary Phases : • distinct entities (solid & liquid) • solubility limit reached • different composition (and structure) • distinct boundaries b/w phases single phase, polycrystalline multi-phase alloys (polycrystalline) F C o r B Microstructure Pb-Sn Cu-Ni Phases αα + β
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Section 4 Phase diagrams - Section 4 PHASE DIAGRAMS (Smith...

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