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Impurity segregation to voids in doped tungsten ribbon filaments

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Abstract

Filaments of Al-, Si-, and K-doped tungsten foil, 0.00254 cm thick, were heated to 2300°C in vacuo until a hot spot developed. Within the hot spot were voids varying in size from about 50 to 6000Å. The larger voids were faceted with the major facets parallel to {110}. The relative surface tensions in the doped foil were in the order {110} < {112}< {111} < {100} as determined from a model of the voids. Selected area diffraction showed that the void surfaces were coated with a thin epitaxial layer of potassium with [311] W ‖[311] K in the majority of cases.

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Authors and Affiliations

  1. Corporate Research and Development, Materials Characterization Branch, General Electric Company, 12345, Schenectady, NY

    J. L. Walter (Metallurgist in the Metallurgy Laboratory), P. Rao (Materials Scientist) & R. R. Russell (Technical Specialist)

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  1. J. L. Walter
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  2. P. Rao
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  3. R. R. Russell
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Walter, J.L., Rao, P. & Russell, R.R. Impurity segregation to voids in doped tungsten ribbon filaments. Metall Trans A 6, 1775–1784 (1975). https://doi.org/10.1007/BF02642307

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