Hostname: page-component-745bb68f8f-5r2nc Total loading time: 0 Render date: 2025-01-29T23:54:26.705Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Vukcevich, M.R., Proc Fifth Int. Tungsten Symposium - Budapest, (MPR Publishing, Bellstone 1990), p. 157.Google Scholar
2. Briant, C.L., Proc Fifth Int. Tungsten Symposium - Budapest, (MPR Publishing, Bellstone 1990), p. 169.Google Scholar
3. Vukcevich, M.R., Briant, C.L and Pugh, J.W., GEL Report, Cleveland (1993), ( to be published)Google Scholar
4. Csako, J., Toth, Cs.L., Meszaros, I., Neugebauer, J., and Horacsek, O., Proc Fifth Int. Tungsten Symposium - Budapest, (MPR Publishing, Bellstone 1990), p. 132.Google Scholar
5. Snow, D.P., The Metallurgy of Doped/Non-Sag Tungsten, Pink, E. and Bartha, L., Editors, (Elsvier Applied Science, 1989), p. 189.Google Scholar
6. Bewley, B.P.,Proc Fifth Int. Tungsten Symposium - Budapest, (MPR Publishing, Bellstone 1990), p. 227.Google Scholar
7. Walter, J.L., Lou, K. and Vukcevich, M.R., Proc. 12th Int. Plansee Conf., 1, 493 (1989).Google Scholar
8. Hosford, W.F., Trans. AIME, 230, 12 (1964).Google Scholar
9. Langford, G. and Cohen, Morris, Trans. ASM, 62, 623 (1969).Google Scholar
10. Friedel, J., Dislocations, (Pergamon Press 1964), p. 21.Google Scholar
11. Hull, D., Beardmore, P. and Valentine, A.P., Wright-Patterson Air Force Base Report AFMLTR- 66-369, February 1967), pp. 3–26.Google Scholar
12. Tavernelli, J., Johnson, C. and Hehemann, R.F., GEL Report, Cleveland (1974).Google Scholar
13. Nichols, F.A. and Mulins, W.W., Trans AIME, 233, 1840 (1965); JAP, 36,1826 (1965).Google Scholar
14. Moon, D.M. and Koo, R.C., Met. Trans, 2, 2115 (1971).CrossRefGoogle Scholar
15. Vukcevich, M.R., Johnson, J. and Lasch, W.A., (to be published).Google Scholar