Dislocation behaviour as a function of applied stress has been studied in the stressed state in a zone-refined aluminium single crystal at room themperature using the Lang X-ray topography technique. The ends of moving primary dislocations make an angle to the surface according to the angle found by solving Lothe's energy equation. Reactions between new dislocations and grown-in ones having parallel Burgers vector, take place at very low stresses and form dislocation bends which may operate as single-ended Frank-Read sources.
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O. Lohne (1973) studied this question.
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