ENGR 240 - 10.26.07

ENGR 240 - 10.26.07 - ENGR 240 October 26, 2007 Phase...

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ENGR 240 – October 26, 2007 Phase diagrams o Definitions Component chemical constituent (element or compound of a material) EX. Brass has Copper and Zinc components System Specific body of a material Alloys consisting for same components EX. Lead-tin solder alloys are a part of the lead-tin system Phase Homogeneous portion of a system Has uniform physical and chemical characteristics Single component system’s phases o Solid, liquid, gas Multi-component system o Multiple solid and liquid (and vapor) phases Phase diagram Graphical representation of relationships between environmental constraints (i.e. temperature and pressure), composition, and phase stability o Represents equilibrium conditions. Phase Equilibrium No change in system with time at equilibrium If its free energy is at a minimum for a specific combination of T, P, and composition Solubility limit
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This note was uploaded on 04/07/2008 for the course ENGR 240 taught by Professor Gross during the Fall '07 term at Bucknell.

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ENGR 240 - 10.26.07 - ENGR 240 October 26, 2007 Phase...

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