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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

REFERENCES

1Iwahashi, Y., Horita, Z., Nemoto, M. and Langdon, T.G.: The process of grain refinement in equal-channel angular pressing. Acta Mater. 46, 3317 (1998).CrossRefGoogle Scholar
2Valiev, R.Z., Islamgaliev, R.K. and Alexandrov, I.V.: Bulk nanostructured materials from severe plastic deformation. Prog. Mater. Sci. 45, 103 (2000).CrossRefGoogle Scholar
3Lee, S., Utsunomity, A., Akamatsu, H., Neishi, K., Furukawa, M., Horita, Z. and Langdon, T.G.: Influence of scandium and zirconium on grain stability and superplastic ductilities in ultrafine-grained Al-Mg alloys. Acta Mater. 50, 533 (2002).CrossRefGoogle Scholar
4Muňoz-Morris, M.A., Garcia, C. and Morris, D.G.: Mechanical behaviour of dilute Al-Mg alloy processed by equal channel angular pressing. Scripta Mater. 48, 213 (2003).CrossRefGoogle Scholar
5Valiev, R.Z., Kozlov, E.V., Ivanov, Y.F., Lian, J., Nazarov, A.A. and Baudelet, B.: Deformation-behavior of ultra-fine-grained copper. Acta Metall. Mater. 42, 2467 (1994).CrossRefGoogle Scholar
6Gholinia, A., Prangnell, P.B. and Markushev, M.V.: The effect of strain path on the development of deformation structures in severely deformed aluminium alloys processed by ECAE. Acta Mater. 48, 1115 (2000).CrossRefGoogle Scholar
7Oliver, W.C. and Pharr, G.M.: An improved technique for determining hardness and elastic-modulus using load and displacement sensing indentation experiments. J. Mater. Res. 7, 1564 (1992).CrossRefGoogle Scholar
8Basinski, S.J. and Basinski, Z.S.: in Dislocation in Solids, 4, edited by Nabarro, F.R.N. (Amsterdam, North-Holland, 1979), p. 263.Google Scholar
9Yoshinaga, H., Matsuno, S. and Kurishita, H.: Dislocation density and internal-stress in an Al-5.7 at percent-Mg alloy. Trans. JIM. 26, 423 (1985).CrossRefGoogle Scholar
10Meyers, M.A. and Chawla, K.K.: Mechanical Behavior of Materials (Prentice-Hall, New Jersey, 1999), p. 92Google Scholar
11Zielinski, W., Huang, H., and Gerberich, W.W., Microscopy and microindentation mechanics of single-crystal Fe-3 wt-percent-Si .2. TEM of the indentation plastic zone, J. Mater. Res. 8, 1300 (1993).Google Scholar
12Kramer, D., Huang, H., Kriese, M., Robach, J., Nelson, J., Wright, A., Bahr, D. and Gerberich, W.W.: Microscopy and microindentation mechanics of single-crystal Fe-3 wt-percent-Si.2. TEM of the indentation plastic zone. J. Mater. Res. 8, 1300 (1993).Google Scholar