Paper Title:
Nitrogen Diffusion in the Nb-2.0wt%Ti Measured by Mechanical Spectroscopy
  Abstract

Metals that present bcc crystalline structure, when receiving addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, undergo significant changes in their physical properties, being able to dissolve great amounts of those interstitial elements, thus forming solid solutions. Niobium and most of its alloys possess bcc crystalline structure and, as Brazil is the largest world exporter of this metal, it is fundamental to understand the interaction mechanisms between interstitial elements and niobium or its alloys. In this paper, mechanical spectroscopy (internal friction) measurements were performed in Nb-2.0wt%Ti alloys containing nitrogen in solid solution. The experimental results presented complex internal friction spectra and with the addition of substitutional solute, it was observed interactions between the two types of solutes (substitutional and interstitial), considering that the random distribution of the interstitial atoms was affected by the presence of substitutional atoms. Interstitial diffusion coefficients, pre-exponential factors and activation energies were calculated for nitrogen in the Nb-2.0wt%Ti alloys.

  Info
Periodical
Defect and Diffusion Forum (Volumes 273-276)
Edited by
Andreas Öchsner and Graeme E. Murch
Pages
256-260
DOI
10.4028/www.scientific.net/DDF.273-276.256
Citation
C. R. Grandini, L. Monteiro da Silva, L. H. de Almeida, O. Florêncio, H. R. Z. Sandim, "Nitrogen Diffusion in the Nb-2.0wt%Ti Measured by Mechanical Spectroscopy", Defect and Diffusion Forum, Vols. 273-276, pp. 256-260, 2008
Online since
February 2008
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$32.00
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