Week 3

Question 1

In what material do you find crystalline structures

Answer 1

All metals
The majority of ceramic materials
Some polmers

Question 2

What is entropy?

Answer 2

Is the degree of disorder in rge system

Question 3

What is APF stand for ?

Answer 3

Atomic packing factor

Question 4

What is BCC

Answer 4

Body centred cubic structure

Question 5

What do crystalline cell look like ?

Answer 5

Every order a packed chose to gether

Question 6

What does polycrystalline cell look

Answer 6

Packed to gether with parts of the cell separating

Question 7

What does an Amorphous look like ?

Answer 7

With the unit cell all separated

Question 8

What are most engineering materials crystalline stucher

Answer 8

Polycrystalline

Question 9

What does polymorphism mean? And what some examples ?

Answer 9

Is the ability of a solid material to exist in more the one state.

Like in graphite and diamond

Question 10

At what temperature does iron change from because to fcc

Answer 10

912c to 1400c

Question 11

What is X-Ray diffraction ?

Answer 11

It’s when you send an x-ray a crystalline stucher to get a mage

Question 12

What are the 3 types of defects

Answer 12

Line defect
Area defects
Point defects

Question 13

What are the 3 types of point defects

Answer 13

Vacancy atom
Interstitial atom
Substitutions atoms

Question 14

What is line defect type?

Answer 14

Dislocation

Question 15

What is the area defect type?

Answer 15

Grain boundaries

Question 16

What are the 4 rules forming a alloy?

Answer 16

1. The difference in atomic radii between host and guest <15%
2. The crystal structure must be the same
3. The electronegativities must be similar
4. The valances should be the same