Abstract
The high temperature performance of doped tungsten wire is closely related to the size, shape and distribution of potassium bubbles that it contains. In this work the morphology of potassium bubbles in doped tungsten wire was studied using a JEM-1000 HVEM after annealing the wire at temperatures ranging from room temperature up to its melting point. The process of bubble formation was observed by in situ experiments using the heating holder of the HVEM. From the observations, a mechanism has been proposed for the formation, faceting, migration and coalescence of potassium bubbles in the wire, which might explain the strengthening effect of potassium doping against sagging and early failure of the wire in service.
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