The ternary Ni–Al–Co embedded-atom-method potential for γ/γ’ Ni-based single-crystal superalloys：Construction and application

doi:10.1088/1674-1056/23/3/033401

Abstract An Ni–Al–Co system embedded-atom-method potential is constructed for the γ(Ni)/γ’(Ni₃Al) superalloy based on experiments and first-principles calculations. The stacking fault energies (SFEs) of the Ni(Co, Al) random solid solutions are calculated as a function of the concentrations of Co and Al. The calculated SFEs decrease with increasing concentrations of Co and Al, which is consistent with the experimental results. The embedding energy term in the present potential has an important influence on the SFEs of the random solid solutions. The cross-slip processes of a screw dislocation in homogenous Ni(Co) solid solutions are simulated using the present potential and the nudged elastic band method. The cross-slip activation energies increase with increasing Co concentration, which implies that the creep resistance of γ (Ni) may be improved by the addition of Co.

Keywords: interatomic interaction potential embedded-atom method Ni-based single-crystal superalloys

Received: 31 July 2013
Revised: 23 September 2013
Accepted manuscript online:

PACS:	34.20.Cf	(Interatomic potentials and forces)
	61.72.Nn	(Stacking faults and other planar or extended defects)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2011CB606402) and the National Natural Science Foundation of China (Grant No. 51071091).

Corresponding Authors: Wang Chong-Yu
E-mail: cywang@mail.tsinghua.edu.cn

Cite this article:

Du Jun-Ping (杜俊平), Wang Chong-Yu (王崇愚), Yu Tao (于涛) The ternary Ni–Al–Co embedded-atom-method potential for γ/γ’ Ni-based single-crystal superalloys：Construction and application 2014 Chin. Phys. B 23 033401

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The ternary Ni–Al–Co embedded-atom-method potential for γ/γ’ Ni-based single-crystal superalloys：Construction and application

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