Molecular Dynamics Simulation of Dislocation-γ-Precipitate Interactions in γ’-Precipitates

Abstract:

Article Preview

There are clear experimental evidences of the formation of either spherical or platelet γ-precipitates inside cubic γ’-precipitates in nickel-based superalloys, which strengthen the mechanical property of the alloy. In this work, molecular statics (MS) and dynamics (MD) simulations of the interaction between a super edge dislocation and a γ-precipitate in γ’-precipitates were performed. The strengthening mechanism was then investigated by comparing the simulation results with the theoretical prediction. As the result, it could be found that the critical resolved shear stress (CRSS) of the interaction has a strong dependence on the shape of the γ-precipitate, and could be well predicted by the theory of precipitation strengthening. Especially, the stacking-fault, chemical, coherency and interface strengthening play a major role in determining the CRSS. Finally, the interaction under a finite temperature was simulated using the MD simulations. It was found that the influence of temperature on the interaction is negligibly small.

Info:

Periodical:

Key Engineering Materials (Volumes 462-463)

Edited by:

Ahmad Kamal Ariffin, Shahrum Abdullah, Aidy Ali, Andanastuti Muchtar, Mariyam Jameelah Ghazali and Zainuddin Sajuri

Pages:

425-430

DOI:

10.4028/www.scientific.net/KEM.462-463.425

Citation:

A. Takahashi and Y. Terada, "Molecular Dynamics Simulation of Dislocation-γ-Precipitate Interactions in γ’-Precipitates", Key Engineering Materials, Vols. 462-463, pp. 425-430, 2011

Online since:

January 2011

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.