Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-27T02:08:42.387Z Has data issue: false hasContentIssue false
  • English
  • Français

Microstructure-Resistivity Correlations in Controlled Waspaloy Microstructures

Published online by Cambridge University Press:  26 February 2011

V. Siva Kumar G. Kelekanjeri  and
Rosario A Gerhardt
V. Siva Kumar G. Kelekanjeri
Affiliation:
[email protected], Georgia Institute of Technology, Materials Science and Engineering, 771 Ferst Drive,, Room 288,, Love Bldg,, Atlanta, GA, 30332, United States
Rosario A Gerhardt
Affiliation:
[email protected], 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 at high homologous temperatures for long service times. Literature on electrical resistivity studies of age-hardening superalloys is limited. The current work is focused on developing microstructure-electrical resistivity correlations in controlled Waspaloy microstructures. The microstructures are ‘controlled’ as the size distribution of g¢ precipitates is varied systematically. The microstructures are produced upon aging the initial homogenized alloy at nominal temperatures of 700°C, 800°C and 875°C for times up to 100 hrs. Resistivity measurements did not reveal a g¢ nucleation regime for the sampled aging intervals. The primary microstructural evolution mechanism contributing to the observed changes in resistivity was g¢ coarsening. Interestingly, the microstructures resulting from progressive aging at 700°C showed a slow transformation of etch-pits from perfect polygonal shapes to more irregular shapes.

Keywords

nucleation & growthelectrical propertiesscanning electron microscopy (SEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 977: Symposium FF – Processing-Structure-Mechanical Property Relations in Composite Materials , 2006 , 977-FF04-11
Copyright
Copyright © Materials Research Society 2007

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.)

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