[5pts] Write out the Hall Petch equation (hint: consists of…
Write out the Hall Petch equation (hint: consists of 4 parameters.) For online submission, you can use ‘S’ instead of ‘sigma’ if desired. Which 2 of the parameters are material constants? Briefly define (in a couple of words) the other two parameters of the equation (i.e. not the material constants from part a) In 1 sentence, what does the Hall Petch equation describe (in terms of strengthening)? Hall Petch strengthening can only be achieved up to a certain limit. What is this limit (provide the approximate quantitative value)? What mechanism occurs after this limit is exceeded? What is the typical effect of Hall Petch strengthening on ductility?