Question

A specimen of commercially pure copper has a strength of 240 MPa. Estimate its average grain diameter using the Hall-Petch equation.

Answer 1

Answer:

3.115× $10^{-3}$ meter

Explanation:

hall-petch constant for copper is given by

      $S_0$=25 MPa

      k=0.12 for copper

now according to hall-petch equation

$S_Y$=$S_0$ +$\frac{K}{\sqrt{D}}$

240=25+$\frac{0.12}{\sqrt{D}}$

D=3.115× $10^{-3}$ meter

so the grain diameter using the hall-petch equation=3.115×  $10^{-3}$ meter