Abstract
A method has been developed which allows the dependence of internal friction on strain amplitude for a crystal to be measured in a period of 30 s. This method was used to study the variation of internal friction with strain amplitude in sodium chloride single crystals as a function of neutron irradiation. The results were found to agree with the Granato- Lucke theory of strain-amplitude dependent internal friction and this theory was used to examine the variation of pinned dislocation loop length with irradiation time. It was found that the loop-length variation from amplitude-dependent results was different to that from amplitude- independent results. An explanation is offered for this difference.
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