ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Recent 3-Dimensional Atom Probe (3DAP) experimental observations showed theformation of spherical γ-precipitates at a central region of γ’ phases in nickel based superalloys. The γprecipitates should give a significant effect to the material strength. Whereat, in this work, we firstdeveloped a simulation technique for the investigation of the formation of γ-precipitates in γ’ phases,which is based on a combination of an Embedded Atom Method (EAM) interatomic potentialdesigned for Molecular Dynamics (MD) and the kinetic lattice Monte Carlo (KLMC) method. As ademonstration of the KLMC simulation, the formation of the L12 structure was simulated from aninitial state with randomly distributed aluminum atoms (25at.%Al). Finally, the γ’ phase with the L12structure is formed in the entire simulation volume. To understand the fundamental mechanism of theformation of the L12 structures, the binding energies between a pair of aluminum atoms in a nickelsingle crystal were calculated using MD method. The result gave a clear picture of the mechanism.The stability of the γ-precipitate was also investigated using the MD method. Finally, the formation ofγ-precipitates was simulated using the KLMC method. The dependence of the formation on thetemperature condition is discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.815.pdf
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