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  Quantifying deformation processes near grain boundaries in α titanium using nanoindentation and crystal plasticity modeling

Su, Y., Zambaldi, C., Mercier, D., Eisenlohr, P., Bieler, T. R., & Crimp, M. A. (2016). Quantifying deformation processes near grain boundaries in α titanium using nanoindentation and crystal plasticity modeling. International Journal of Plasticity, 86, 170-186. doi:10.1016/j.ijplas.2016.08.007.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B23B-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B23C-3
Genre: Journal Article

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 Creators:
Su, Yang1, Author              
Zambaldi, Claudio2, Author              
Mercier, David2, Author              
Eisenlohr, Philip3, Author              
Bieler, Thomas R.1, Author              
Crimp, Martin A.1, Author              
Affiliations:
1Michigan State University, East Lansing, MI, USA, ou_persistent22              
2Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863392              
3Michigan State University, Chemical Engineering and Materials Science, East Lansing, MI 48824, USA, ou_persistent22              

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Free keywords: Atomic force microscopy; Dislocations (crystals); Finite element method; Grain boundaries; Indentation; Nanoindentation; Piles; Plasticity; Topography, Crystal plasticity; Crystal plasticity finite element; Crystal plasticity models; Deformation process; Deformation transfer; Dislocation nucleation; Indentation deformation; Low angle boundaries, Single crystals
 Abstract: The influence of grain boundaries on plastic deformation was studied by carrying out nanoindentation near grain boundaries (GBs). Surface topographies of indentations near grain boundaries were characterized using atomic force microscopy (AFM) and compared to corresponding single crystal indent topographies collected from indentations in grain interiors. Comparison of the single crystal indents to indents adjacent to low-angle boundaries shows that these boundaries have limited effect on the size and shape of the indent topography. Higher angle boundaries result in a decrease in the pile-up topography observed in the receiving grain, and in some cases increases in the topographic height in the indented grain, indicating deformation transfer across these boundaries is more difficult. A crystal plasticity finite element (CPFE) model of the indentation geometry was built to simulate both the single crystal and the near grain boundary indentation (bi-crystal indentation) deformation process. The accuracy of the model is evaluated by comparing the point-wise volumetric differences between simulated and experimentally measured topographies. Good agreement, in both single and bi-crystal cases, suggests that the crystal plasticity kinematics plays a dominant role in single crystal indentation deformation, and is also essential to bi-crystal indentation. Despite the good agreement, some differences between experimental and simulated topographies were observed. These discrepancies have been rationalized in terms of reverse plasticity and the inability of the model to capture the full resistance of the boundary to slip. This is discussed in terms of dislocation nucleation versus glide in the model and in the physics of the slip transfer process. © 2016 Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2016-11-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.ijplas.2016.08.007
BibTex Citekey: Su2016170
 Degree: -

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Title: International Journal of Plasticity
  Abbreviation : Int. J. Plast.
Source Genre: Journal
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Publ. Info: New York : Pergamon
Pages: - Volume / Issue: 86 Sequence Number: - Start / End Page: 170 - 186 Identifier: ISSN: 0749-6419
CoNE: https://pure.mpg.de/cone/journals/resource/954925544230