Abstract
With Transmission Electron Microscopy (TEM) the dislocation density in a molybdenum single crystal directly after cold work has been determined. Subsequently, the trapping and precipitation of helium at cold-work induced lattice defects (vacancies, dislocations) has been examined. From a comparison with Thermal Helium Desorption Spectrometry (THDS) data, it was found that the vacancies do not evolve to helium precipitates in a one to one ratio as expected. The observed results can be explained by considering the vacancy production during cold work to be strongly inhomogeneous in space. This is in agreement with resistance recovery data. No significant helium precipitation at dislocations has been observed.
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