Small-angle neutron scattering study of potassium-doped tungsten wire samples

T. Grósz, S. Borbély, P. Harmat, A. Ioffe, L. Rosta

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

2D SANS measurements on K doped tungsten samples after uniaxial thermomechanical working (swaging and wire drawing) showed strong anisotropy in the cold worked samples due to the elongated K containing bubbles in the direction of working. The anisotropy vanished completely only after annealing at T=2650 K. In order to reach lower Q range, both as received and annealed tungsten wire samples were measured at HMI on the V12a double-crystal diffractometer. In vertical sample position with wire axes perpendicular to the horizontal scattering plane, broadening due to the scattering on the macroscopic surface of wires was superimposed suppressing the microscopic effect. On the contrary, in horizontal position the scattering curves displayed no difference and coincided with the resolution curve of the instrument. The measurement was repeated at IFF, Julich on the DKD high resolution diffractometer and revealed the presence of a small portion of extremely large residual pores characterized by radius of gyration Rg = 1590±20 nm.

Original languageEnglish
Pages (from-to)446-450
Number of pages5
JournalMaterials Science Forum
Volume378-381
Issue numberII
Publication statusPublished - 2001

Fingerprint

Tungsten
Neutron scattering
Potassium
potassium
tungsten
neutron scattering
Diffractometers
wire
Wire
Scattering
Anisotropy
diffractometers
Swaging
Wire drawing
swaging
scattering
anisotropy
gyration
curves
Annealing

Keywords

  • Sintering
  • Small-angle neutron scattering
  • Tungsten

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Small-angle neutron scattering study of potassium-doped tungsten wire samples. / Grósz, T.; Borbély, S.; Harmat, P.; Ioffe, A.; Rosta, L.

In: Materials Science Forum, Vol. 378-381, No. II, 2001, p. 446-450.

Research output: Contribution to journalArticle

Grósz, T, Borbély, S, Harmat, P, Ioffe, A & Rosta, L 2001, 'Small-angle neutron scattering study of potassium-doped tungsten wire samples', Materials Science Forum, vol. 378-381, no. II, pp. 446-450.
Grósz, T. ; Borbély, S. ; Harmat, P. ; Ioffe, A. ; Rosta, L. / Small-angle neutron scattering study of potassium-doped tungsten wire samples. In: Materials Science Forum. 2001 ; Vol. 378-381, No. II. pp. 446-450.
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