Solidification

Question 1

Nucleation point

Answer 1

The first atom to stop being a liquid and become a solid and is the start of the solidification phase.

Question 2

What are the two types of structure formed at the nucleation point.

Answer 2

Amorphous and crystalline

Question 3

Amorphous

Answer 3

When there is no structure to how atoms are formed at the nucleation point.

Question 4

Crystalline

Answer 4

Have a structure of how atoms are formed at the nucleation point.

Question 5

Dendrites

Answer 5

Are branch like structures formed at the nucleation point that reach outwards.

Question 6

Grain / crystal

Answer 6

When dendrites meet they stop growing and for a grain/ crystal.

Question 7

Grain boundaries

Answer 7

Is the gap within the grains that have not been filled.

Question 8

What are the three types of crystals that are formed

Answer 8

Chill crystals, columnar crystals and equiaxed crystals

Question 9

Chill crystals

Answer 9

Are the first points to cool from the nucleation point. Due to rapid cooling are small and close together meaning there is less room to grow.

Question 10

Columnar crystals

Answer 10

The second layer of cooling. Due to slowly cooling and being close together the dendrites form long thing crystals.

Question 11

Equiaxed crystals

Answer 11

The final layer of cooling meaning reduced nucleation points. These are the largest crystals due to having increased room to grow.