Chapter 9 Slides

# Chapter 9 Slides - Chapter 9 Phase Diagrams Begin lectures...

This preview shows pages 1–10. Sign up to view the full content.

1 Chapter 9 Chapter 9 Phase Diagrams Phase Diagrams Begin lectures on Apr. 10, 08

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 Chapter 9: Phase Diagrams Chapter 9: Phase Diagrams • Terminology • P-T diagrams for pure materials • Interpretation of Composition-T phase diagrams • Simple binary phase diagrams • Development of equilibrium microstructures on cooling in binary systems The Phase Rule: P + F = C + 2 P = number of phases – identifiable regions with distinctive structure or composition F = number of degrees of freedom of the system (T, P, C 0 ) C = the number of components (elements) in the system
3 Phases : The physically and chemically distinct material regions which have homogeneous and identifiable structure (e.g., α , β ). Components : The elements that are present in the mixture (e.g., Al and Cu) Aluminum- Copper Alloy Definitions Definitions - - Components and Phases Components and Phases α (darker phase) β (lighter phase)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
4 Simple phase diagrams Simple phase diagrams Sketches of simple phase diagrams • Single component P-T (pressure-temperature) phase diagrams • Examples of simple binary Composition-T phase diagrams – Complete solid solution – Eutectic phase diagram – Peritectic phase diagram • Number of phases across the phase diagram
5 P P - - T diagram for water (H T diagram for water (H 2 2 O) O) Note: H 2 O is actually a two-component system (H and O), that behaves like a one-component system. This is due to the fixed 2:1 H:O ratio in H 2 O • How is melting defined? • How is boiling defined? • Why does dry ice (CO 2 ) “smoke”, and what is the “smoke”?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
6 What do all these images have in What do all these images have in common? common? brittnay.files.wordpress.com/2007/11/fog_and_truck.jpg www.portagepool.ca/images/steam1.jpg www.windows.ucar.edu/glossary/ima ges/liquid_nitrogen_sm.jpg www.dkimages.com/discover/previews/ 853/848299.JPG www.ni- photos.jmcwd.com/clouds- blue-sky2.jpg www.nationwidesnowmaking. com/images/two.jpg updatecenter.britannica.com/eb/image?binary Id=93820&rendTypeId=4 Fog Steam room Liquid nitrogen Clouds Boiling water Making snow Condensation on mirror
7 Cooking utensils Cooking utensils www.coopext.colostate.edu/TRA/cfs/food/IMAGE62.JPG gotethnicfoods.com/pictures/Regular/UT0002.jpg www.ehow.com/images/GlobalPhoto/Articles/2001020/IMG_1938_Full.jpg Pressure cooker Double boiler – being used to melt chocolate

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
8 Phase Phase Equilibria Equilibria 0.1278 1.8 FCC Cu 0.1246 1.9 FCC Ni r (nm) Electro- negativity Crystal Structure • Both have the same crystal structure (FCC) and have similar electronegativities and atomic radii ( W. Hume – Rothery rules ) suggesting high mutual solubility. Start with a simple system (e.g., Ni-Cu solution) • Ni and Cu are totally miscible in all proportions.
9 Ni Ni - - Cu Phase Diagram Cu Phase Diagram • Indicates phases as function of T , C o , and P .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/20/2008 for the course EML 3234 taught by Professor Hellstrom during the Spring '08 term at FSU.

### Page1 / 39

Chapter 9 Slides - Chapter 9 Phase Diagrams Begin lectures...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online