Chapter 8 : Phase Diagrams Flashcards
axis of phase diagram graphs?
temperature vs weight percent
axis for cooling curve graph?
temperature vs time
what is a phase?
a region of material distinct from other regions by
chemical composition and
structure
what is a solid solution?
material mixes with another
includes a solute and solvent
what three questions do you ask when looking at phase diagrams?
- what phase is present
- what is the composition of each phase
- what are the amounts of each phase
how do you determine the composition?
use a tie line
what is a tie line
a horizontal line drawn from the center of the point to the nearest solid and liquid line
how do you determine the amount of each phase?
use the lever rule
what are the lever rule equations?
liquid Ws-Wo/Ws-Wl
solid Wo-Wl/Ws-Wl
what is a eutectic reaction?
liquid –> 2 solids
what is a eutectic point?
100% liquid turns to 100% eutectic
What is the difference between hypo and hypereutectic
hypo - left
hyper - right
what are terminal phases?
phases at either end of the diagram
what are intermediate phases?
unique complex structures (crystals) that are hard, strong, and very brittle
what do dotted lines represent?
the data in not all inclusive
