Week 6

Question 1

Crystals deform on specific _____ and directions

Answer 1

Planes and directions!

Question 2

Material paradigm: very SMALL changes to _______ can lead to _______ changes in _______

Answer 2

Structure

Big

Properties

Question 3

Material paradigm: even in FCC, there’s a lot of ________

Answer 3

Space

Question 4

Planes: when do we use ROUND brackets

Answer 4

For single planes

Question 5

Planes: when do we use CURLY brackets

Answer 5

For families of planes

Question 6

Directions: when do we use SQUARE brackets

Answer 6

For individual directions

Question 7

Directions: when do we use ANGLE brackets

Answer 7

For families of directions

Question 8

Crystal imperfections can be beneficial

Question 9

Question 10

List the 6 types of crystal scale defects

Answer 10

Substitutional foreign atom

Interstitial foreign atom

Edge dislocation

Vacancy

Unit cell of an alpha ion

Acre dislocation

Question 11

3 types of point defects

Answer 11

Vacancies

Self-interstitial

Solute

Question 12

Point defects: 2 type of solutes

Answer 12

Substitutional

Interstitial

Question 13

Point defects: what does a vacancy look like

Answer 13

Question 14

Point defects: what does a substitutional impurity look like

Answer 14

Question 15

Point defects: what does an interstitial impurity look like

Answer 15

Question 16

Point defects: what does a self interstitial look like

Answer 16

Question 17

Question 18

Question 19

Solute: Substitutional atoms must be similar in

(4 things)

Answer 19

Atomic size

Crystal structure

Electronegatitivty

Valence

Question 20

Atomic % and weight %: SMALL additions can have a ______ impact

(And explain)

Answer 20

1080 steel has 0.8 wt% carbon, which is 3.7 at%

Question 21

What are line defects called

Answer 21

Dislocations

Question 22

What is “b”

Answer 22

Burgers vector

Question 23

What does the line arrow show

Answer 23

Edge dislocation line

Question 24

Which is the dislocation line and which is the Burgers vector

Answer 24

Dislocation line: close to A

Burgers vector: red arrow

Question 25

What are interfacial defects called

Answer 25

Grain boundaries

Question 26

The distance between two adjacent and parallel planes of atoms is a function of the
______ ______ (h,k,I) and the ________ _______

Answer 26

Miller indices