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What is the Hall Petch equation. When I Google (images) I get::

σ

or

σ

In the first k

The second equation is in a study book I have.

Am I making a math error? Thanks.

σ

_{y}= σ_{o}+ k_{y}/ √dor

σ

_{y}= σ_{o}+ k_{y}d^{1/2}In the first k

_{y}is divided by √d and in the second multiplied by √d.The second equation is in a study book I have.

Am I making a math error? Thanks.

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