Hostname: page-component-76fb5796d-r6qrq Total loading time: 0 Render date: 2024-04-26T16:01:52.670Z Has data issue: false hasContentIssue false
  • English
  • Français

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 chinh@metal.elte.hu
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Dimiduk, D.M., Woodward, C., LeSar, R., and Uchic, M.D.: Scale-free intermittent flow in crystal plasticity. Science 312, 1188 (2006).CrossRefGoogle ScholarPubMed
2.Uchic, M.D., Shade, P.A., and Dimiduk, D.M.: Plasticity of micrometer-scale single crystals in compression. Annu. Rev. Mater. Res. 39, 361 (2009).Google Scholar
3.Greer, J.R. and De Hosson, J.Th.M.: Plasticity in small-sized metallic systems: intrinsic versus extrinsic size effect. Prog. Mater. Sci. 56, 654 (2011).CrossRefGoogle Scholar
4.Csikor, F.F., Motz, C., Weygand, D., Zaiser, M., and Zapperi, S.: Dislocation avalanches, strain bursts, and the problem of plastic forming at the micrometer scale. Science 318, 251 (2007).CrossRefGoogle ScholarPubMed
5.Ispánovity, P.D., Groma, I., Györgyi, G., Csikor, F.F., and Weygand, D.: Submicron plasticity: yield stress, dislocation avalanches, and velocity distribution. Phys. Rev. Lett. 105, 085503 (2010).Google Scholar
6.Valiev, R.Z.: Nanostructuring of metals by severe plastic deformation for advanced properties. Nature Mater. 3, 511 (2004).Google Scholar
7.Zhilyaev, A.P. and Langdon, T.G.: Using high-pressure torsion for metal processing: fundamentals and applications. Prog. Mater. Sci. 53, 893 (2008).Google Scholar
8.Meyers, M.A., Mishra, A., and Benson, D.J.: The deformation physics of nanocrystalline metals: experiments, analysis, and computations. JOM 58(4), 41 (2006).Google Scholar
9.Valiev, R.Z., Alexandrov, I.V., Zhu, Y.T., and Lowe, T.C.: Paradox of strength and ductility in metals processed by severe plastic deformation. J. Mater. Res. 17, 5 (2002).Google Scholar
10.Chinh, N.Q., Szommer, P., Horita, Z., and Langdon, T.G.: Experimental evidence for grain boundary sliding in aluminium processed by severe plastic deformation. Adv. Mater. 18, 34 (2006).Google Scholar
11.Valiev, R.Z., Murashkin, M.Y., Kilmametov, A., Straumal, B., Chinh, N.Q., and Langdon, T.G.: Unusual super-ductility at room temperature in an ultrafine-grained aluminum alloy. J Mater. Sci. 45, 4718 (2010).Google Scholar
12.Chinh, N.Q., Csanádi, T., Győri, T., Valiev, R.Z., Straumal, B.B., Kawasaki, M., and Langdon, T.G.: Strain rate sensitivity studies on an ultrafine-grained Al-30wt%Zn alloy using micro- and nanoindentation. Mater. Sci. Eng. A 543, 117 (2012).Google Scholar
13.Straumal, B., Valiev, R., Kogtenkova, O., Zieba, P., Czeppe, T., Bielanska, E., and Faryna, M.: Thermal evolution and grain boundary phase transformations in severely deformed nanograined Al–Zn alloys. Acta Mater. 56, 6123 (2008).Google Scholar