L9 - Precipitate hardening

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Precipitate hardening graph cutting

F = λτb

e.g. As λ decreases, the stress to cause dislocation detachment τ increases

<p>F = <span>λτb</span></p><p><em><span>e.g.</span></em><span> As </span>λ<em><span> decreases, the stress to cause dislocation detachment </span></em>τ<em><span> increases</span></em></p>
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Bowing

At high r, F increases until f becomes zero. At these high F, the dislocation can bypass the particle by leaving a dislocation loop (Orowan loop) around the particle

<p><span>At high </span><em><span>r, F</span></em><span> increases until </span><em><span>f</span></em><span> becomes zero. At these high </span><em><span>F</span></em><span>, the dislocation can bypass the particle by leaving a dislocation loop (Orowan loop) around the particle</span></p>
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<p>Twinning </p>

Twinning

  • Favoured at low temperatures and high strain rates – both situations where thermal activation of dislocations is hard.

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