AMME1362 Chapter Notes - Chapter 9: Phase Diagram, Phase Rule, Phase Boundary

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9. 1 introduction: phase diagrams for alloy systems represent the characteristic correlations between microstructure and mechanical properties, phase diagrams provide valuable information about melting, casting, crystallization and other phenomena. Definitions and basic concepts: component- outlines the pure metals and/or compounds of which an alloy is composed, system- has two meanings. A system may refer to a specific body of material under consideration (e. g. a ladle of molten steel). Initially syrup solution forms, until the solubility limit is reached or the solution becomes saturated with sugar. Excess sugar added forms the syrup liquid solution and solid crystals of undissolved sugar. E. g. at 20 the max solubility of sugar in water is 65 wt%. 9. 3 phases: a phase may be defined as a homogenous portion of system that has uniform physical and chemical characteristics. Every pure material is considered to be a phase. Example: water and ice in the same container- same physical properties (liquid/solid) but chemically identical.

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