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Fabrication and thermal stability of a nanocrystalline Ni–Al–Cr alloy: Comparison with pure Cu and Ni

Published online by Cambridge University Press:  31 January 2011

Keiichiro Oh-ishi ,
Zenji Horita ,
David J. Smith ,
Ruslan Z. Valiev ,
Minoru Nemoto  and
Terence G. Langdon
Keiichiro Oh-ishi
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812–8581, Japan
Zenji Horita
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812–8581, Japan
David J. Smith
Affiliation:
Center for Solid State Science and Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287
Ruslan Z. Valiev
Affiliation:
Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia
Minoru Nemoto
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812-8581, Japan
Terence G. Langdon
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, California 90089-1453
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Abstract

A Ni–Al–Cr alloy with an initial grain size of ∼60 μm was subjected to torsion straining to a strain of ∼7 at room temperature, thereby reducing the grain size to ∼34 nm. Similar torsion straining with samples of pure Cu and pure Ni gave grain sizes of ∼170 and ∼130 nm, respectively. Inspection of the Ni–Al–Cr alloy after torsion straining revealed highly strained regions containing dislocations associated with lattice distortions but with an absence of any Ni3Al ordered phase. The ultrafine grains in the Ni–Al–Cr alloy were extremely stable at high temperatures, and it was possible to retain a grain size of less than 100 nm after annealing at temperatures up to ∼900 K. By contrast, there was rapid grain growth in the samples of pure Cu and Ni at annealing temperatures in the vicinity of ∼500 K. The stability of the grains in the Ni–Al–Cr alloy is attributed to the formation of a Ni3Al-based ordered phase after annealing at ∼650–700 K. The presence of this phase also leads to an apparent negative slope in the standard Hall–Petch relationship.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4200 - 4207
Copyright
Copyright © Materials Research Society 1999

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