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Sunil
SunilIron
Asked: April 28, 20202020-04-28T09:35:23+05:30 2020-04-28T09:35:23+05:30In: Physical Metallurgy & Heat treatment

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

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    1. Kathirvelan R Silver Learner
      2020-04-28T18:33:55+05:30Added an answer on April 28, 2020 at 6:33 pm

      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. Sunil Iron
      2020-04-29T07:34:10+05:30Added an answer on April 29, 2020 at 7:34 am

      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. Gaurav Kumar Gold B.TECH, NIT DURGAPUR
      2020-05-06T18:12:58+05:30Added an answer on May 6, 2020 at 6:12 pm

      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. C Patel Metallurgy Platinum⭐ GATE Metallurgy Coaching
      2020-12-02T09:43:48+05:30Added an answer on December 2, 2020 at 9:43 am

      It is number of dislocation per unit area.

      It is number of dislocation per unit area.

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