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Inverse Hall–Petch effect in quasi- and nanocrystalline materials

Padmanabhan, K. A. and Sripathi, Sriharsha and Hahn, H. and Gleiter, H. (2014):
Inverse Hall–Petch effect in quasi- and nanocrystalline materials.
In: Materials Letters, ELSEVIER SCIENCE BV, Netherlands, pp. 151-154, 133, ISSN 0167577X,
[Online-Edition: http://dx.doi.org/10.1016/j.matlet.2014.06.153],
[Article]

Abstract

Inverse Hall-Petch effect/grain size softening in quasi- and nanocrystalline materials at ambient/low temperatures is attributed to mesoscopic (similar to a grain diameter or more) grain/interphase boundary sliding controlled flow. Equations for estimating the free energy of activation for the rate controlling process, the free volume fraction present in a basic sliding unit and the average number of grain boundaries that align to form a planar interface during superplastic deformation are given in some of our earlier papers. These predictions are verified here using experimental data pertaining to one quasi- and two nanocrystalline systems. The agreement between the predictions and the experimental observations is satisfactory. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Article
Erschienen: 2014
Creators: Padmanabhan, K. A. and Sripathi, Sriharsha and Hahn, H. and Gleiter, H.
Title: Inverse Hall–Petch effect in quasi- and nanocrystalline materials
Language: English
Abstract:

Inverse Hall-Petch effect/grain size softening in quasi- and nanocrystalline materials at ambient/low temperatures is attributed to mesoscopic (similar to a grain diameter or more) grain/interphase boundary sliding controlled flow. Equations for estimating the free energy of activation for the rate controlling process, the free volume fraction present in a basic sliding unit and the average number of grain boundaries that align to form a planar interface during superplastic deformation are given in some of our earlier papers. These predictions are verified here using experimental data pertaining to one quasi- and two nanocrystalline systems. The agreement between the predictions and the experimental observations is satisfactory. (C) 2014 Elsevier B.V. All rights reserved.

Journal or Publication Title: Materials Letters
Volume: 133
Publisher: ELSEVIER SCIENCE BV, Netherlands
Uncontrolled Keywords: Grain size softening/inverse Hall-Petch effect, Grain boundary sliding, Rate controlling process, Quasi-crystals, Nanocrystalline materials
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 10 Feb 2016 09:50
Official URL: http://dx.doi.org/10.1016/j.matlet.2014.06.153
Identification Number: doi:10.1016/j.matlet.2014.06.153
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