What is the Hall Petch equation. When I Google (images) I get::(adsbygoogle = window.adsbygoogle || []).push({});

σ_{y}= σ_{o}+ k_{y}/ √d

or

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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# Hall Petch Equation

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