ch09_2_Tu - Chapter 9 1 ISSUES TO ADDRESS • When we...

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Unformatted text preview: Chapter 9 - 1 ISSUES TO ADDRESS... • When we combine two elements... what is the resulting equilibrium state? • In particular, if we specify...-- the composition (e.g., wt% Cu - wt% Ni), and-- the temperature (T ) then... How many phases form? What is the composition of each phase? What is the amount of each phase? Chapter 9: Phase Diagrams Chapter 9 - 2 • Components : The elements or compounds which are present in the alloy (e.g., Al and Cu) • Phases : The physically and chemically distinct material regions that form (e.g., α and β ). Aluminum- Copper Alloy Components and Phases α (darker phase) β (lighter phase) Adapted from chapter- opening photograph, Chapter 9, Callister, Materials Science & Engineering: An Introduction, 3e. Chapter 9 - 3 70 80 100 60 40 20 Temperature (ºC) C = Composition (wt% sugar) L ( liquid solution i.e., syrup) 20 100 40 60 80 L (liquid) + S (solid sugar) Effect of Temperature & Composition • Altering T can change # of phases: path A to B . • Altering C can change # of phases: path B to D . water- sugar system Adapted from Fig. 9.1, Callister & Rethwisch 8e. D (100ºC,C = 90) 2 phases B (100ºC,C = 70) 1 phase A (20ºC,C = 70) 2 phases Chapter 9 - 4 Phase Diagrams • Indicate phases as a function of T, C, and P. • For this course:- binary systems: just 2 components....
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This note was uploaded on 10/03/2011 for the course EMCH 371 taught by Professor Dai-hattrick during the Spring '11 term at South Carolina.

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ch09_2_Tu - Chapter 9 1 ISSUES TO ADDRESS • When we...

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