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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
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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)

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