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ME215-4CMP - FUNDAMENTALS OF METAL ALLOYS EQUILIBRIUM...

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Veljko Samardzic ME-215 Engineering Materials and Processes FUNDAMENTALS OF METAL ALLOYS, EQUILIBRIUM DIAGRAMS Chapter 4
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.2 What is a Phase? Phase is a form of material having characteristic structure and properties. More precisely: form of material with identifiable composition (chemistry), definable structure , and distinctive boundaries (interfaces) which separate it from other phases.
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.2 Phases Phase can be continuous (air in the room) or discontinuous (salt grains in the shaker). Gas, liquid or solid. Pure substance or solution ( uniform structure throughout).
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.3 Equilibrium Phase Diagrams Graphic mapping of the natural tendencies of a material or a material system (equilibrium for all possible conditions). Primary variables: temperature, pressure and composition. P-T diagram (the simplest).
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.3 Temperature-Composition Diagrams Engineering processes conducted at atmospheric pressure (P/T variations). The most common: temperature- composition phase diagrams.
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.3 Cooling Curves Cooling curves for NaCl-H20 combinations:
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.3 Cooling Curves Partial equilibrium diagram of NaCl-H20 system
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.3 Solubility Solubility limits. Degree of solubility determines properties. I-Two metals completely soluble in each other. II- Two metals soluble in liquid state and insoluble in solid state. III-Two metals soluble in liquid state and partially soluble in solid state.
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.3 Complete Solubility Copper-Nickel equilibrium diagram
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Veljko Samardzic ME-215 Engineering Materials and Processes 4.3 Partial Solid Solubility Degree of solubility depends on temperature At max. solubility, 183 C: lead holds up to 19.2 wt % tin in a single phase solution, and tin holds up to 2.5wt% lead and still be a single phase.
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