Paper Title:
3D-Atom Probe Investigation of Vacancy Induced Interdiffusion during High Pressure Torsion Deformation
  Abstract

Concentration gradients resulting from long range diffusion during Severe Plastic Deformation (SPD) have been investigated with the 3D Atom Probe technique (3D-AP). First, in a pearlitic steel where alloying elements (Mn, Si and Cr) are partitioned between the ferrite and carbides in the non-deformed state. After processing by High Pressure Torsion (HPT), they are homogeneously distributed in the nanostructure, indicating that long range diffusion occurred along with the dissolution of carbides. 3D-AP data of a Cu-Fe composite processed by HPT show as well a significant interdiffusion of Cu and Fe, probably promoted by additional vacancies. On the basis of these experimental data, and using the theory described for irradiated materials, vacancy fluxes and vacancy production rates were estimated assuming that new vacancies are continuously produced and eliminated on grain boundaries.

  Info
Periodical
Materials Science Forum (Volumes 503-504)
Edited by
Zenji Horita
Pages
433-438
DOI
10.4028/www.scientific.net/MSF.503-504.433
Citation
X. Sauvage, "3D-Atom Probe Investigation of Vacancy Induced Interdiffusion during High Pressure Torsion Deformation", Materials Science Forum, Vols. 503-504, pp. 433-438, 2006
Online since
January 2006
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