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Iron
Asked: 2020-04-28T09:35:23+05:30 In:

Dislocation density has units of inverse of mm square. Why then according to hall petch equation it is taken as inverse function of grain size i.e. having units of only inverse of mm ??

Dislocation density has units of inverse of mm square. Why then according to hall petch equation it is taken as inverse function of grain size i.e. having units of only inverse of mm ??
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    4 Answers

    1. Silver Learner

      Please refer strengthening mechanism in Dieter book. Grain size is inverse of squre root of dislocation density. Not just inverse of dislocation density. Then only you get mm unit.

      Please refer strengthening mechanism in Dieter book.

      Grain size is inverse of squre root of dislocation density. Not just inverse of dislocation density. Then only you get mm unit.

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    2. Iron

      Refer to page 191 in dieter it is clearly written dislocation density= 1/D

      Refer to page 191 in dieter it is clearly written dislocation density= 1/D

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    3. Gold B.TECH, NIT DURGAPUR

      Grain size is inverse of squre root of dislocation density

      Grain size is inverse of squre root of dislocation density

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    4. Platinum⭐ GATE Metallurgy Coaching

      It is number of dislocation per unit area.

      It is number of dislocation per unit area.

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