Hall-Petch Relation Calculation?

Using the Hall-Petch relation, estimate the yield strength, σy, of a Cu-Zn alloy (brass) when the average grain diameter is 30 μm.

σy = is the yield strength
σ0 = 25 MPa is the internal friction stress
ky = 12.5 MPa·mm1/2 is a material constant
d = is the average grain size

I get an answer of 97.17 MPa, is this correct, if not i’ll post all of my working. Thanks!


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