Paper Title:
Molecular Dynamics Simulation of Dislocation-γ-Precipitate Interactions in γ’-Precipitates
  Abstract

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, 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
$32.00
Share

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

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

Authors: Jing Guo Lei, Ping Liu, Bao Hong Tian, Xiao Zhi, Xiao Tian Jing
Abstract:The Cu-Ag-Cr alloy is a kind of aging hardening copper alloy and has excellent combination properties of high strength and good electrical...
41
Authors: Sverre Gulbrandsen-Dahl, Knut E. Moen, Flemming J.H. Ehlers, Calin D. Marioara, Ketill Olav Pedersen, Knut Marthinsen
Abstract:Standard and high resolution transmission electron microscopy (TEM) and advanced post processing of the TEM images have been applied for...
229
Authors: Austin Cox, Theocharis Baxevanis, Dimitris C. Lagoudas
I. Advanced Materials and Magnetohydrodynamics
Abstract:Thermomechanical properties of precipitated NiTi shape memory alloys are investigated using the finite element method. The precipitated...
65
Authors: M.R. Ahmadi, L. Whitmore, E. Povoden-Karadeniz, M. Stockinger, A. Falahati, E. Kozeschnik
Abstract:In the present study, we describe a comprehensive and consistent physical model for the yield strength change in Allvac®...
7