Hall-Petch relation
= Hall-Petch relation
{c}
{title2=$\sigma_y=\sigma_0+k_y d^{-1/2}$}
The empirical scaling $\sigma_y=\sigma_0+k_y d^{-1/2}$ of yield <stress> with average <grain size> in its applicable regime. It is not a universal law for arbitrarily small grains or high-temperature deformation.