Hostname: page-component-cb9f654ff-p5m67 Total loading time: 0 Render date: 2025-09-01T08:16:18.250Z Has data issue: false hasContentIssue false
  • English
  • Français

Microstructure-Resistivity Correlations in Controlled WaspaloyMicrostructures

Published online by Cambridge University Press:  26 February 2011

V. Siva Kumar G. Kelekanjeri  and
Rosario A Gerhardt
V. Siva Kumar G. Kelekanjeri
Affiliation:
sk140@mail.gatech.edu, Georgia Institute of Technology, Materials Science and Engineering, 771 Ferst Drive,, Room 288,, Love Bldg,, Atlanta, GA, 30332, United States
Rosario A Gerhardt
Affiliation:
rosario.gerhardt@mse.gatech.edu, Georgia Institute of Technology, Materials Science and Engineering, 771 Ferst Drive,, Room 288,, Love Bldg,, Atlanta, GA, 30332, United States
Get access

Abstract

Nickel-base superalloys are an important class of metallic ‘nanocomposite’structural materials known for their good strength retention abilities athigh homologous temperatures for long service times. Literature onelectrical resistivity studies of age-hardening superalloys is limited. Thecurrent work is focused on developing microstructure-electrical resistivitycorrelations in controlled Waspaloy microstructures. The microstructures are‘controlled’ as the size distribution of g¢ precipitates is variedsystematically. The microstructures are produced upon aging the initialhomogenized alloy at nominal temperatures of 700°C, 800°C and 875°C fortimes up to 100 hrs. Resistivity measurements did not reveal a g¢ nucleationregime for the sampled aging intervals. The primary microstructuralevolution mechanism contributing to the observed changes in resistivity wasg¢ coarsening. Interestingly, the microstructures resulting from progressiveaging at 700°C showed a slow transformation of etch-pits from perfectpolygonal shapes to more irregular shapes.

Keywords

nucleation & growthelectrical propertiesscanning electron microscopy (SEM)

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

1. Smith, W. F., Structure and Properties of Engineering Alloys, McGraw-Hill Inc., NY, 1993.Google Scholar
2. Panseri, C. and Federighi, T., Acta Metallurgica, 8, 217 (1960).Google Scholar
3. Ferragut, R., Somoza, A. and Torriani, I., Materials Science and Engineering, A334, 1 (2002).Google Scholar
4. White, R. J., Fisher, S. B., Miller, K. M. and Swallow, G. A., Journal of Nuclear Materials, 52, 51 (1974).Google Scholar
5. Al-Aql, A. A., Materials and Design, 24, 547 (2003).Google Scholar
6. Rana, A. M., Materials Chemistry and Physics, 80, 228 (2003).Google Scholar
7. Kumar, V. Siva Kelekanjeri, G. and Gerhardt, R. A., to be published in Advanced Materials Research, 15–17, pp. 876–881, 2007.Google Scholar
8. Martin, J. W., Doherty, R. D. and Cantor, B., Stability of Microstructure in Metallic Systems, Cambridge University Press, NY, 1997.Google Scholar
9. Kumar, V. Siva Kelekanjeri, G., Moss, L. K. and Gerhardt, R. A., in preparation for Acta Materialia. Google Scholar
10. Kumar, V. Siva Kelekanjeri, G. and Gerhardt, R. A., in preparation for Acta Materialia. Google Scholar
11. Noble, B. and Bray, S. E., Materials Science and Engineering, A266, 80 (1999).Google Scholar