Nuclear magnetic resonance, stored energy, and the density of dislocations in deformed aluminium
- 1 February 1962
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 7 (74), 279-284
- https://doi.org/10.1080/14786436208211862
Abstract
The mean-square width of the nuclear magnetic resonance absorption line and the density of dislocations observed by electron microscopy have been measured in specimens of cold-rolled aluminium. Cold rolling has been found to increase the mean-square line width by up to 120%, and the broadening is proportional to the density of dislocations. The stored energy has been calculated from the line broadening using a simple model, and the results are in reasonable agreement with the energy measured directly. The apparent energy of a dislocation in aluminium has been found to have the surprisingly high value of 18.8 × 10−4 erg/cm, and it is suggested that the density of dislocations observed in aluminium by electron microscopy does not represent the bulk value.Keywords
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