Chapter 9 notes - • Altering T can change the number of...

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Chapter 9: Phase Diagrams When we combine two elements, what is the resulting equilibrium state? In particular, if we specify the composition and the temperature…then how many phases form? What is the composition of each phase? What is the amount of each phase? Phases Has a uniform physical property – solid, liquid gas Has uniform chemical characteristics Systems Are composed of one or more phases Single phase systems are termed homogeneous systems Multiphase systems are termed mixtures or heterogeneous systems Number of phases in a system is dependent on temperature and concentration Phase Equilibria: Solubility Limit Solution – solid, liquid, or gas solutions, single phase Mixture – more than one phase Solubility limit – maximum concentration for which only a single phase solution exists Effects of Temperature and Composition
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Unformatted text preview: • Altering T can change the number of phases Components and Phases • Components – the elements or compounds which are present in the allow • Phases – the physically and chemically distinct material regions that form Criteria for Solid Solubility • Simple system o both have the same crystal structure and have similar electronegativities and atomic radii (W. Hume-Rothery rules) suggesting high mutual solubility o Ni and Cu are totally soluble in one another for all proportions The Lever Rule • Tie line – connects the phases in equilibrium with each other -> also sometimes called an isotherm Binary Eutectic Systems • Eutectic – liquid transforms to two solid phases • Eutectoid – one solid phase transforms to two other solid phases • Peritectic – liquid and one solid phase transform to a second solid phase...
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Chapter 9 notes - • Altering T can change the number of...

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