Grain boundaries

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Last updated 7:20 PM on 6/9/26
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8 Terms

1
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When grains form, they can be:

Equiaxed or columned

2
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Equiaxed:

Same size in all directions

3
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Columned:

Elongated

4
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What are grain boundaries ?

Regions between crystals
Transitions between lattice regions
Slightly disordered
Lower density

5
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What does lower density mean?

High mobility

High diffusibility

High chemical reactivity

6
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How is grain refinement done?

Each grain has a nucleation event

speed up cooling rate

insert “grain refiners” to up numbers of nuclei

7
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The result of faster cooling is:

Smaller grain size

8
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