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Proceedings Paper

Tomographic characterization of grain-size correlations in polycrystalline Al-Sn
Author(s): Carl E. Krill; Kristian M. Deobrich; Daniel Michels; Andreas Michels; Christoph Rau; Timm Weitkamp; Anatoly A. Snigirev; Rainer Birringer
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Paper Abstract

The inadequacies of current analytical models for grain growth are thought to arise in part from their mean-field nature: they ignore the presence of correlations in the sizes of neighboring grains induced by the process of grain growth itself. Although grain-size correlations have been identified in microstructures generated by computer simulations of grain growth, no comparable evidence has been obtained from real samples - primarily because of the experimental difficulties associated with evaluating this inherently three-dimensional property. Using absorption- contrast x-ray microtomography, we have attempted to characterize the network of grain boundaries in polycrystalline samples of Al doped with up to 3 at.% Sn. In principle, since the tin atoms segregate to the grain boundaries, it should be possible to determine the size and relative position of each grain from a three-dimensional reconstruction of the Sn distribution, from which the desired correlation function could be calculated directly. However, the grain boundaries in Al-Sn are not uniformly decorated with tin, which presents a formidable challenge to quantifying the microstructural properties of such samples. Significant progress toward overcoming this problem has been achieved by applying a constrained phase-field grain-growth algorithm to an approximate microstructure gleaned from the tomographic contrast data.

Paper Details

Date Published: 7 January 2002
PDF: 8 pages
Proc. SPIE 4503, Developments in X-Ray Tomography III, (7 January 2002); doi: 10.1117/12.452836
Show Author Affiliations
Carl E. Krill, Univ. des Saarlandes (Germany)
Kristian M. Deobrich, Univ. des Saarlandes (Germany)
Daniel Michels, Univ. des Saarlandes (Germany)
Andreas Michels, Univ. des Saarlandes (Germany)
Christoph Rau, European Synchrotron Radiation Facility (France)
Timm Weitkamp, European Synchrotron Radiation Facility (France)
Anatoly A. Snigirev, European Synchrotron Radiation Facility (France)
Rainer Birringer, Univ. des Saarlandes (Germany)

Published in SPIE Proceedings Vol. 4503:
Developments in X-Ray Tomography III
Ulrich Bonse, Editor(s)

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