Deformation Mechanisms in Nanocrystalline Materials

As a result of recent investigations on nanocrystalline (nc) materials, extensive experimental data on the deformation behavior of these materials have become available. In this article, an analysis of these data was performed to identify the requirements that a viable deformation mechanism should m...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2010-04, Vol.41 (4), p.823-837
Main Authors: Mohamed, Farghalli A., Yang, Heather
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Deformation
Exact sciences and technology
Grain size
Materials Science
Metallic Materials
Metallurgy
Metals. Metallurgy
Nanotechnology
Shear strain
Structural Materials
Surfaces and Interfaces
Symposium: Mechanical Behavior of Nanostructured Materials
Thin Films
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Summary:As a result of recent investigations on nanocrystalline (nc) materials, extensive experimental data on the deformation behavior of these materials have become available. In this article, an analysis of these data was performed to identify the requirements that a viable deformation mechanism should meet in terms of accounting for the mechanical characteristics and trends that are revealed by the data. The results of the analysis show that a viable deformation mechanism is required to account for the following: (1) an activation volume the value of which is in the range 10 to 40 b 3 ; (2) an activation energy that is close to the activation energy for boundary diffusion but that decreases with increasing applied stress; (3) the magnitudes of deformation rates that cover wide ranges of temperatures, stresses, and grain sizes; (4) inverse Hall–Petch behavior; and (5) limited ductility. The validity of available deformation mechanisms for nc materials is closely examined in the light of these requirements.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-009-0103-z