6.6 Consider dislocations blocked with an average spacing of l in a copper crystal. If the flow stress is controlled by the stress necessary to operate a Frank-Read source, compute the dislocation density p in this crystal when it is deformed to a point where the resolved shear stress in the slip plane is 42 MPa. Take G = 50 GPa. %3D

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Crystalline Imperfections

The crystalline imperfections are described as the geometrical defects in the crystal due to incorrect arrangement of atoms, impurity, vacancy, and many more. It is not possible to achieve a perfect or ideal crystal, practically.