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Potassium in Grain Boundaries of Tungsten

Published online by Cambridge University Press:  25 February 2011

Milan R. Vukcevich
Milan R. Vukcevich*
Affiliation:
GE Lighting #5430, Nela Park, Cleveland, Ohio 44112
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Abstract

Most of the recent work on the role of potassium in tungsten wire deals with the origin of bubbles and their effect on the recrystallization process. Two very important areas are neglected: the effect of potassium strings on the mechanical properties of wire during manufacturing, and the differences in distribution of bubbles in the grain boundaries vs. the bulk. Although other advances in our understanding of potassium in tungsten are reviewed, the main attention is on these two neglected areas. Derived are expressions for the yield point of the fibrous wire structure, and for the increased concentration of bubbles in the transverse boundaries. The theory and experiments are in good agreement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 537
Copyright
Copyright © Materials Research Society 1994

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