Difference between revisions of "Chris Booth-Morrison"
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I am a third-year graduate student studying the temporal evolution of nickel-
I am a third-year graduate student studying the temporal evolution of nickel-superalloys by atom-probe tomography (APT).
Revision as of 18:38, 26 July 2007
|Research:||Evolution of Precipitates in Ni-Based Superalloys|
|Education:||B.Eng Metallurgical Engineering, McGill University|
|Publications:||Publications by Booth-Morrison in our database|
Materials Science and Engineering
2220 North Campus Drive
Evanston, IL 60208
I am a third-year graduate student studying the temporal evolution of nickel-based superalloys by atom-probe tomography (APT).
We are interested in studying the kinetic pathways which lead to the decomposition of the γ-matrix phase by the formation of nanometer-sized γ'-precipitates. APT of the Ni-Al-Cr nanostructures provides an in-depth look at the compositional and nanostructural evolution of the γ’-precipitate phase as it evolves. The decomposition of the γ-matrix phase, from the early stages of solute-rich γ'-nuclei formation, to the subsequent growth and coarsening of γ’-precipitates, can be accessed within the framework of classical nucleation, growth and coarsening theories. The effects of varying the solute concentrations on the temporal evolution of Ni-Al-Cr alloys can be determined in order to provide a more quantitative understanding of the kinetic pathways that lead to phase separation.
The addition of Ta to the ternary Ni-Al-Cr system results in the formation of a large volume fraction of γ'-precipitates which demonstrate very strong solute partitioning. Ta has been shown to be a strong γ'-precipitate former and solid-solution strenghtener and is known to improve high-temperature strength, creep, fatigue and corrosion properties, all of which are desirable for use in nickel-based superalloys in high-temperature applications.