By V. B. John (auth.)
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7 MPa, which is about 1/380 of the theoretical shear strength calculated in (a). The reason for the discrepancy is that in the theoretical calculation it is assumed that the crystal lattice is perfect. The presence of dislocation defects in the crystal permits slip by dislocation movement at much lower levels of stress. 3 Describe, with the aid of sketches, (a) an edge dislocation, (b) a screw dislocation and (c) a dislocation loop. In each case, show the relationship between the dislocation line and the Burger's vector.
61 x w-Io m contains an edge dislocation lying in a (111) plane. Determine the magnitude and direction of the Burger's vector. 4 The direction of the Burger's vector is normal to the dislocation line, namely normal to a (110) plane. The direction normal to a (110) plane is [110]. 553 X 10-Iom. 5 Describe with the aid of sketches four types of point defect which may occur in metal crystals and indicate the way in which they affect the lattice. 5 A vacancy occurs when an atom is missing from a normal lattice point.
In a complete loop, it will be of edge type at two diametrically opposite points, the edge dislocations being of opposite sign. Similarly the two parts of the loop of pure screw type will be of opposing sign. To obtain the Burger's vector, b, describe a circuit moving an equal number of lattice spacings in each direction. In a dislocated lattice, the closure vector necessary to complete the circuit is the Burger's vector. The Burger's vector is normal to an edge dislocation but parallel to a screw dislocation.