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Observations of unique plastic behavior in micro-pillars of an ultrafine-grained alloy

Published online by Cambridge University Press:  15 June 2012

Nguyen Q. Chinh ,
Tivadar Győri ,
Ruslan Z. Valiev ,
Péter Szommer ,
Gábor Varga ,
Károly Havancsák  and
Terence G. Langdon
Nguyen Q. Chinh*
Affiliation:
Department of Materials Physics, Eötvös Loránd University, H-1117 Budapest, Hungary
Tivadar Győri
Affiliation:
Department of Materials Physics, Eötvös Loránd University, H-1117 Budapest, Hungary
Ruslan Z. Valiev
Affiliation:
Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia
Péter Szommer
Affiliation:
Department of Materials Physics, Eötvös Loránd University, H-1117 Budapest, Hungary
Gábor Varga
Affiliation:
Department of Materials Physics, Eötvös Loránd University, H-1117 Budapest, Hungary
Károly Havancsák
Affiliation:
Department of Materials Physics, Eötvös Loránd University, H-1117 Budapest, Hungary
Terence G. Langdon
Affiliation:
Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1453, andMaterials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
*
Address all correspondence to Nguyen Q. Chinh at [email protected]
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Abstract

When ultrafine-grained (UFG) samples are deformed plastically, it is necessary to consider the role of grain boundaries even at the micrometer scale in sample size. We report here the occurrence of intensive grain boundary sliding (GBS) at room temperature in micro-pillars of a UFG aluminum alloy having an unusually high strain rate sensitivity. A consequence of this GBS is that the intermittent flow with detrimental strain avalanches characterizing micro-sized conventional crystals is not present in UFG materials, thereby illustrating a potential for effectively applying these UFG materials in micro-devices.

Type
Research Letters
Information
MRS Communications , Volume 2 , Issue 3 , September 2012 , pp. 75 - 78
Copyright
Copyright © Materials Research Society 2012

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