Chapter 9 Part 1

Question 1

Phase

Answer 1

Homogenous region of material with uniform physical and chemical properties

Question 2

Solution

Answer 2

Mixture of 2 substances that are intermingled at the atomic level

Question 3

Composition

Answer 3

The amount of each element present in phase

Question 4

Amount (or weight percent) of a phase

Answer 4

Amount of each element present in a phase

Question 5

Solidus

Answer 5

Upper boundary below which there is only a solid phase

Question 6

Liquidus

Answer 6

Lower boundary below which there is only a liquid phase

Question 7

Solvus

Answer 7

Boundary line which designates the limits of solubility of an element within a solid phase.

On one side of a solvus will be a pure solid phase, on the other will be a mixed phase region.

Question 8

Microconstituent

Answer 8

A region of material with a characteristic micro-structure

May or may not be a phase

Question 9

Solid Solubility

Hume-Rothery Rule

Answer 9

1. Atomic radii must be within 15% of each other
2. The crystal structure must be exactly the same
3. They must share same valence
4. They must have similar electronegativity

Question 10

Unary Phase Diagram

Answer 10

Temperature and pressure for axes.

Show conditions under which solid, liquid, and vapor phases exist

Question 11

Binary Phase Diagram

Answer 11

Have composition on the x-axis and temperature on the y-axis, and show the phases that exist under various conditions

Solid phases designated by greek letters

Liquid phases designated by L with subscript numbers

Important temperature and compositions are called out

Question 12

Lever Rule

Answer 12

wt% of phase = Length of arm on opposite side of fulcrum from phase / total length of lever