L8 - Work hardening dislocation density

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6 Terms

1
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Why is it difficult to transmit dislocations across a grain boundary?

  • Slip plane isn’t continuous

  • Orientation of next grain = different hence τcrss = different

2
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Obstacle effect

Dislocations encountering the grain boundary pile-up at the obstacle

3
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  • At linear bit in beginning, no work hardening as no boundaries for dislocations to be stuck hence keeps sliding

<ul><li><p>At linear bit in beginning, no work hardening as no boundaries for dislocations to be stuck hence keeps sliding</p></li></ul>
4
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Work hardening coefficient

dτ = change in shear stress

dγ = change in shear strain

<p><span>dτ = change in shear stress</span></p><p><span>dγ = change in shear strain</span></p>
5
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Complexity effect

This is due to the availability of many slip systems in a polycrystal consisting of randomly oriented grains

6
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Energy to deform crystal by some amount:

σdε = Στdγ (sum of all the single crystal shear strains at the shear stress)