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3D DDD modelling of dislocation-precipitate interaction in a nickel-based single crystal superalloy under cyclic deformation

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journal contribution
posted on 19.02.2018, 14:41 by B. Lin, Minsheng Huang, Liguo ZhaoLiguo Zhao, Anish RoyAnish Roy, Vadim SilberschmidtVadim Silberschmidt, N.C. Barnard, M.T. Whittaker, G. McColvin
Strain-controlled cyclic deformation of a nickel-based single crystal superalloy has been modelled by using three-dimensional (3D) discrete dislocation dynamics (DDD) for both [001] and [111] orientations. The work focused on the interaction between dislocations and precipitates during cyclic plastic deformation at elevated temperature, which has not been well studied yet. A representative volume element (RVE) with cubic γ’-precipitates was chosen to represent the material, with enforced periodical boundary conditions. In particular, cutting of superdislocations into precipitates was simulated by a back-force method. The global cyclic stress-strain responses were captured well by the DDD model when compared to experimental data, particularly the effects of crystallographic orientation. Dislocation evolution showed that considerably high density of dislocations was produced for [111] orientation when compared to [001] orientation. Cutting of dislocations into the precipitates had a significant effect on the plastic deformation, leading to material softening. Contour plots of in-plane shear strain proved the development of heterogeneous strain field, resulting in the formation of shear-band embryos.

Funding

The work was funded by the EPSRC (Grants EP/M000966/1 and EP/K026844/1) of the UK and in collaboration with GE Power, Dstl (Dr Matthew Lunt) and Rolls-Royce (Dr. Mark Hardy).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Philosophical Magazine

Citation

LIN, B. ... et al, 2018. 3D DDD modelling of dislocation-precipitate interaction in a nickel-based single crystal superalloy under cyclic deformation. Philosophical Magazine, 98 (17), pp.1550-1575.

Publisher

Informa UK Limited, trading as Taylor & Francis Group (© The authors)

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

13/02/2018

Publication date

2018

Notes

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

ISSN

1478-6435

eISSN

1478-6443

Language

en