Dislocation loops in quenched aluminium
Electron transmission micrographs of polycrystalline aluminum quenched from ~600 deg C into iced brine show that the specimens contain many dislocation loops with diameters of the order of several hundred A. Some of the loops are hexagonal in shape, and occur on (111) planes, and have a Burgers vector 1/2 STA110! not in the plane of the loop. The loops are thought to be produced by the collapse of disks of vacancies, and the corresponding: vacancy concentration is 10-4. Some of the loops disappear, while under observation in the microscope, by a mechanism of prismatic slip. In the neighborhood of grain boundaries there is a zone depleted of loops; similar zones are observed near dislocations, whose complex configurations suggest that climb may have taken place. The observations are discussed in relation to the problems of annealing out vacancies, of quench-hardening. and of the origin of the dislocation network.
- Research Organization:
- Cavendish Lab., Cambridge, Eng.; Atomic Energy Research Establishment, Harwell, Berks., Eng.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-12-016418
- OSTI ID:
- 4298187
- Journal Information:
- Philosophical Magazine, Journal Name: Philosophical Magazine Journal Issue: 32 Vol. 3; ISSN 0031-8086
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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