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Mapping single-crystal dendritic microstructure and defects in nickel-base superalloys with synchrotron radiation

Publication ,  Journal Article
Husseini, NS; Kumah, DP; Yi, JZ; Torbet, CJ; Arms, DA; Dufresne, EM; Pollock, TM; Wayne Jones, J; Clarke, R
Published in: Acta Materialia
October 1, 2008

Solidification of single-crystal nickel-base superalloys introduces large-scale segregation of constituent elements and defects such as dislocations and mosaicity. By exploiting the energy tunability and interference capabilities of high-brilliance X-ray radiation, key structural features of the dendritic single crystals were mapped over large areas. Interference and diffraction of synchrotron X-rays revealed significant misorientations between individual dendrites in the as-solidified state. For the first time this mosaic structure was quantified for an array of dendrites and correlated with the density of "grown-in" dislocations whose density ranged from 107 to 108 cm-2. Absorption contrast permitted simultaneous mapping of the distribution of refractory metal additives (e.g. rhenium and tungsten), which segregated preferentially to the dendrite cores with a linear composition gradient toward the interdendritic regions. The results demonstrate that synchrotron X-ray imaging is promising for in situ studies of single-crystal structure and defects in nickel-base superalloys. © 2008 Acta Materialia Inc.

Duke Scholars

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

October 1, 2008

Volume

56

Issue

17

Start / End Page

4715 / 4723

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics
 

Citation

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Husseini, N. S., Kumah, D. P., Yi, J. Z., Torbet, C. J., Arms, D. A., Dufresne, E. M., … Clarke, R. (2008). Mapping single-crystal dendritic microstructure and defects in nickel-base superalloys with synchrotron radiation. Acta Materialia, 56(17), 4715–4723. https://doi.org/10.1016/j.actamat.2008.05.041
Husseini, N. S., D. P. Kumah, J. Z. Yi, C. J. Torbet, D. A. Arms, E. M. Dufresne, T. M. Pollock, J. Wayne Jones, and R. Clarke. “Mapping single-crystal dendritic microstructure and defects in nickel-base superalloys with synchrotron radiation.” Acta Materialia 56, no. 17 (October 1, 2008): 4715–23. https://doi.org/10.1016/j.actamat.2008.05.041.
Husseini NS, Kumah DP, Yi JZ, Torbet CJ, Arms DA, Dufresne EM, et al. Mapping single-crystal dendritic microstructure and defects in nickel-base superalloys with synchrotron radiation. Acta Materialia. 2008 Oct 1;56(17):4715–23.
Husseini, N. S., et al. “Mapping single-crystal dendritic microstructure and defects in nickel-base superalloys with synchrotron radiation.” Acta Materialia, vol. 56, no. 17, Oct. 2008, pp. 4715–23. Scopus, doi:10.1016/j.actamat.2008.05.041.
Husseini NS, Kumah DP, Yi JZ, Torbet CJ, Arms DA, Dufresne EM, Pollock TM, Wayne Jones J, Clarke R. Mapping single-crystal dendritic microstructure and defects in nickel-base superalloys with synchrotron radiation. Acta Materialia. 2008 Oct 1;56(17):4715–4723.
Journal cover image

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

October 1, 2008

Volume

56

Issue

17

Start / End Page

4715 / 4723

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics