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.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
W. F. Smith, Structure and Properties of Engineering Alloys, McGraw-Hill Inc., NY, 1993.
C. Panseri and T. Federighi, Acta Metallurgica, 8, 217 (1960).
R. Ferragut, A. Somoza and I. Torriani, Materials Science and Engineering, A334, 1 (2002).
R. J. White, S. B. Fisher, K. M. Miller and G. A. Swallow, Journal of Nuclear Materials, 52, 51 (1974).
A. A. Al-Aql, Materials and Design, 24, 547 (2003).
A. M. Rana, Materials Chemistry and Physics, 80, 228 (2003).
V. Siva Kumar G. Kelekanjeri and R. A. Gerhardt, to be published in Advanced Materials Research, 15–17, pp. 876–881, 2007.
J. W. Martin, R. D. Doherty and B. Cantor, Stability of Microstructure in Metallic Systems, Cambridge University Press, NY, 1997.
V. Siva Kumar G. Kelekanjeri, L. K. Moss and R. A. Gerhardt, in preparation for Acta Materialia.
V. Siva Kumar G. Kelekanjeri and R. A. Gerhardt, in preparation for Acta Materialia.
B. Noble and S. E. Bray, Materials Science and Engineering, A266, 80 (1999).
About this article
Cite this article
Kumar, S.V., Kelekanjeri, G. & Rosario, A.G. Microstructure-Resistivity Correlations in Controlled Waspaloy Microstructures. MRS Online Proceedings Library 977, 411 (2006). https://doi.org/10.1557/PROC-977-0977-FF04-11