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Micro-Indentation of Aluminum Processed by Equal Channel Angular Extrusion

Published online by Cambridge University Press:  03 March 2011

Fuqian Yang ,
Lingling Peng  and
Kenji Okazaki
Fuqian Yang*
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506
Lingling Peng
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506
Kenji Okazaki
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The near-surface deformation of equal-channel angular extruded (ECAE) pure aluminum was investigated using the micro-indentation technique. Compared with fully annealed Al samples, there is a distinguishable difference in the indentation deformation. The unloading slope of the ECAE deformed Al after a short unloading period was found to be less than that of the annealed samples due to plastic recovery. Work hardening was observed, which depended on the history of local deformation. A new relationship between the plastic energy dissipated in the indentation and the applied load was derived, which is supported by the experimental results.

Keywords

IndentationWork hardeningDislocation, severe deformation
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 4 , April 2004 , pp. 1243 - 1248
Copyright
Copyright © Materials Research Society 2004

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References

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