Grain growth and dislocation density evolution in a nanocrystalline Ni–Fe alloy induced by high-pressure torsion

The structural evolution of a nanocrystalline Ni–Fe alloy induced by high-pressure torsion (HPT) was investigated. HPT-induced grain growth occurred via grain rotation and coalescence, forming three-dimensional small-angle sub-grain boundaries. Further deformation eliminates the sub-grain boundaries...

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Bibliographic Details
Published in:Scripta materialia 2011-02, Vol.64 (4), p.327-330
Main Authors: Ni, S., Wang, Y.B., Liao, X.Z., Alhajeri, S.N., Li, H.Q., Zhao, Y.H., Lavernia, E.J., Ringer, S.P., Langdon, T.G., Zhu, Y.T.
Format: Article
Language:English
Subjects:
Boundaries
Coalescing
Dislocation density
Dislocations
Evolution
Grain growth
High-pressure torsion
Intermetallic compounds
Nanocrystalline materials
Nanocrystals
Nickel base alloys
Severe plastic deformation
Storage capacity
Torsion
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Summary:The structural evolution of a nanocrystalline Ni–Fe alloy induced by high-pressure torsion (HPT) was investigated. HPT-induced grain growth occurred via grain rotation and coalescence, forming three-dimensional small-angle sub-grain boundaries. Further deformation eliminates the sub-grain boundaries from which dislocations glide away on different {1 1 1} planes. A significant number of these dislocations come together to form Lomer–Cottrell locks that effectively increase the dislocation storage capacity of the nanocrystalline material. These observations may help with developing strong and ductile nanocrystalline materials.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.10.027