6th quiz

What is the crystallization process?

• the process of a substance changing from a liquid to a solid state

• the process of a substance changing from a gas to a liquid state

• the process of a substance changing from a solid to a liquid state

step of the solidification process

• nucleation, growth of nuclei, formation of grains

• nucleation, growth of nuclei

• nucleation, formation of grains

in which case the nucleations are continue to grow

• when the nuclei reaches a critical size

• when the grain does not reach a critical size

• in any case it continues to grow

types of nucleation

• homogeneous, heterogeneous

• homogeneous

• columnar, equiaxed

What does it mean of critical size?

• the size needed to create the center of the nucleation

• size for dissolve of centre of nucleation

• size needed for growth

what determines grain size

• depends on the arrangement of the atoms

• sizes are the same

• depends on the size of the nuclei

How many crystalline structure do you know?

• 3

• 2

• 1

how many atoms are involved in the body centered cube of crystal structures

• 3

• 2

• 4

how many atoms are involved in the face centered cube of crystal structures

• 3

• 2

• 4