Atomistic Simulations of Compression Tests on gamma-Precipitate Containing Ni3Al Nanocubes

Journal article
(Original article)


Publication Details

Author(s): Houllé FP, Walsh F, Prakash A, Bitzek E
Journal: Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science
Publisher: SPRINGER
Publication year: 2018
Volume: 49A
Journal issue: 9
Pages range: 4158-4166
ISSN: 1073-5623
Language: English


Abstract

The influence of gamma precipitates on the deformation behavior of gamma' Ni3Al nanocubes with {100} side surfaces is investigated by molecular dynamics simulations of uniaxial compression tests at 300 K. The plastic deformation of the nanocubes is caused by the nucleation of Shockley partial dislocations near the cube corners followed by the formation of pseudo-twins. While the dominant deformation mechanisms and the flow stress are not affected by the presence of precipitates, the precipitates reduce the yield stress by up to 10 pct and determine the location of dislocation nucleation. These findings can be rationalized by accounting for the misfit stresses caused by the presence of the gamma precipitates. Within the simulated ranges, the results are independent of cube size, rounding of the cube or precipitate corners, surface roughness, and strain rate. The observed precipitate softening in the dislocation-nucleation-controlled deformation of gamma' NiAl nanocubes is in stark contrast to the strengthening effect caused by the presence of a gamma phase in the gamma' precipitates in the microstructure of typical Ni- and Co-based superalloys.


FAU Authors / FAU Editors

Bitzek, Erik Prof. Dr.-Ing.
Professur für Werkstoffwissenschaften (Simulation und Werkstoffeigenschaften)
Houllé, Frédéric Paul
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Prakash, Aruna Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)


Research Fields

Neue Materialien und Prozesse
Research focus area of a faculty: Technische Fakultät


How to cite

APA:
Houllé, F.P., Walsh, F., Prakash, A., & Bitzek, E. (2018). Atomistic Simulations of Compression Tests on gamma-Precipitate Containing Ni3Al Nanocubes. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 49A(9), 4158-4166. https://dx.doi.org/10.1007/s11661-018-4706-0

MLA:
Houllé, Frédéric Paul, et al. "Atomistic Simulations of Compression Tests on gamma-Precipitate Containing Ni3Al Nanocubes." Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science 49A.9 (2018): 4158-4166.

BibTeX: 

Last updated on 2019-27-05 at 19:15

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