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The identification of second phases within bubbles in annealed doped tungsten wire

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Abstract

Elemental potassium was detected within bubbles formed in annealed, commercially doped tungsten wire by transmission electron microscopy and selected area diffraction. The bubbles in specimens which had been annealed in hydrogen contained liquid potassium, solid potassium, and small quantities of potassium hydride. Only solid potassium was observed within bubbles when specimens were annealed in < 10-5 mm Hg vacuum. The potassium solidified epitaxially on the tungsten bubble surface and had virtually the same lattice orientation. The potassium hydride usually displayed a specific orientation relationship with the solid potassium and the tungsten.

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  1. Refractory Metals Laboratory, Lamp Business Division, General Electric Company, 44117, Cleveland, Ohio

    D. B. Snow (Research Metallurgist)

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  1. D. B. Snow
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Snow, D.B. The identification of second phases within bubbles in annealed doped tungsten wire. Metall Trans 5, 2375–2381 (1974). https://doi.org/10.1007/BF02644019

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