Abstract
The threshold energy surface for permanent atom displacements in copper at 550 K is determined by observing the growth of interstitial-type dislocation loops during electron irradiation in a high-voltage electron microscope. Comparison with the results of King et al. and Baily et al., obtained by measurements of the residual electrical resistivity, permits for the first time a detailed analysis of the variation of the anisotropy of the threshold energy surface of a metal over a wide temperature range. The mechanisms mainly responsible for the temperature dependence, which in f.c.c. metals is particularly pronounced for energy transfers in 〈111〉 directions, are discussed in some detail.
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