Ch9

Question 1

Phase Diagram

Answer 1

Graphical representation of phases present with respect to given intensive variables under equilibrium

Question 2

Liquidus

Answer 2

Locus above which everything is liquid

Question 3

Solidus

Answer 3

Locus below which everything is solid

Question 4

Tie line

Answer 4

connects the phases in equilibrium with each other (connects between one end to the other end in a particular phase region and parallel to composition axis)

Question 5

Isomorphous phase diagram

Answer 5

Has 2 phases

Question 6

Phases

Answer 6

The physically and/or chemically homogeneous material regions present in the phase diagram (e.g., liquid, alpha, and beta [single letters only])

Question 7

Components

Answer 7

The elements or compounds for which the phase diagrams are plotted

Question 8

One component

Answer 8

Urnary

Question 9

Two components

Answer 9

Binary

Question 10

Three components

Answer 10

Ternary

Question 11

Three components

Answer 11

Ternary

Question 12

Intensive Variables

Answer 12

does not dependent on quantity

Question 13

Intensive Variables

Answer 13

does not dependent on quantity (stuff on x-axis, temperature, pressure, composition)

Question 14

Extensive Variables

Answer 14

depends on quantity (mass, volume, # of moles)

Question 15

triple point

Answer 15

where all three phases are in equilibrium (where lines intersect)

Question 16

How to find weight fraction?

Answer 16

Use Lever Rule

Question 17

What kind of structure does slow rate of cooling have?

Answer 17

Equilibrium structure

Question 18

What kind of structure does fast rate of cooling have?

Answer 18

Cored structure

Question 19

Eutectic phase diagram

Answer 19

T_[alpha] > T_[beta] and Terminal solid solution solidifies at temperatures lower than Alpha and Beta

Question 20

Peritectic phase diagram)

Answer 20

T_[Alpha] > T_[Beta] and Terminal solid solution solidifies at temperatures higher than B

Question 21

Solvus

Answer 21

Locus separating different solid phases

Question 22

Solvus

Answer 22

Locus separating different solid phases

Question 23

Invariant Reaction

Answer 23

Phase transformations for which degree of freedom is zero

Question 24

Eutectic Reaction phases?

Answer 24

Liquid to solid + solid (and vice versa)

Question 25

Degree of Freedom

Answer 25

The number of intensive variables you need for explicitly define everything about a phase or phases present on every point on the phase diagram

Question 26

Gibb’s Phase Rule

Answer 26

P + F = C + 1

Question 27

Eutectic (what phases?)

Answer 27

L -> A + B

Question 28

Eutectiod

Answer 28

Gamma = A + B

Question 29

Peritectic

Answer 29

L + B = A