Abstract
The dynamical aspects of streaming are considered. It is found that the calculated characteristic times resulting from intrinsic thermal fluctuations in the CuAu and Fe-32 at.% Ni systems differ by nine to ten orders of magnitude. This is in sharp contrast to the reported experimental observations which have found the characteristic times to be similar. It is proposed that streaming observed in Fe-32% Ni is caused by extrinsic excitations perhaps associated with oscillating thermal stresses resulting from fluctuations in the beam current of the electron microscope. Streaming observed in CuAu may, however, result from intrinsic thermal fluctuations as the calculated characteristic time is in reasonable agreement with reported experimental results.
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