Paper Title:
Oxygen Diffusion in an Nb-Ta Alloy Measured by Mechanical Spectroscopy
  Abstract

When metals that present bcc crystalline structure receive the addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, they undergo significant changes in their physical properties because they are able to dissolve great amounts of those interstitial elements, and thus form solid solutions. Niobium and most of its alloys possess a bcc crystalline structure and, because 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 study, mechanical spectroscopy (internal friction) measurements were performed on Nb-8.9wt%Ta alloys containing oxygen in solid solution. The experimental results presented complex internal friction spectra. With the addition of substitutional solute, interactions between the two types of solutes (substitutional and interstitial) were observed, 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 oxygen in this alloy.

  Info
Periodical
Defect and Diffusion Forum (Volumes 312-315)
Edited by
Andreas Öchsner, Graeme E. Murch and João M.P.Q. Delgado
Pages
1228-1232
DOI
10.4028/www.scientific.net/DDF.312-315.1228
Citation
C. R. Grandini, L. H. de Almeida, D. Rodrigues Júnior, "Oxygen Diffusion in an Nb-Ta Alloy Measured by Mechanical Spectroscopy", Defect and Diffusion Forum, Vols. 312-315, pp. 1228-1232, 2011
Online since
April 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Carlos Roberto Grandini, Luciano Monteiro da Silva, Luciano Henrique de Almeida, Odila Florêncio, Hugo Ricardo Zschommler Sandim
Abstract:Metals that present bcc crystalline structure, when receiving addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon,...
256
Authors: Armando Cirilo Souza, Carlos Roberto Grandini, Odila Florêncio
Abstract:The scientific and technological development in the area of new materials contributed to several applications of niobium and its alloys in...
261
Authors: Carlos Roberto Grandini, Luciano Henrique de Almeida, Renata Abdallah Nogueira, Terlize Cristina Niemeyer
Abstract:Titanium alloys are excellent implant materials for orthopedic applications due to their desirable properties, such as good corrosion...
30
Authors: Carlos Roberto Grandini, Emerson Haruiti Kamimura, José Roberto Severino Martins, Hugo Ricardo Zschommler Sandim, Odila Florêncio
Abstract:Metals with a bcc crystalline structure such as Ti-13V-11Cr-3Al alloys have their physical properties significantly changed through the...
38
Authors: Carlos Roberto Grandini, Odila Florêncio, Walter José Botta Filho
Abstract:The mechanical properties of metals with a body-centered cubic (bcc) structure, such as Nb, Ta, V, and their alloys, are modified with the...
708