Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-18T02:13:22.419Z Has data issue: false hasContentIssue false
  • English
  • Français

Determination of the strain-rate sensitivity of ultrafine-grained materials by spherical nanoindentation

Published online by Cambridge University Press:  06 March 2017

Patrick Feldner Open the ORCID record for Patrick Feldner [Opens in a new window] ,
Benoit Merle  and
Mathias Göken
Patrick Feldner*
Affiliation:
Materials Science & Engineering, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Institute I, D-91058 Erlangen, Germany
Benoit Merle
Affiliation:
Materials Science & Engineering, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Institute I, D-91058 Erlangen, Germany
Mathias Göken
Affiliation:
Materials Science & Engineering, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Institute I, D-91058 Erlangen, Germany
*
a) Address all correspondence to this author. e-mail: patrick.feldner@fau.de
Get access

Abstract

The strain-rate sensitivity of the flow stress represents a crucial parameter for characterizing the deformation kinetics of a material. In this work a new method was developed and validated for determining the local strain-rate sensitivity of the flow stress at different plastic strains. The approach is based on spherical nanoindentation strain-rate jump tests during one deformation experiment. In the case of ultrafine-grained Al and ultrafine-grained Cu good agreement between this technique and macroscopic compression tests has been achieved. In contrast to this, individual spherical nanoindentation experiments at constant strain-rates resulted in unrealistically high strain-rate sensitivities for both materials because of drift influences. Microstructural investigations of the residual spherical imprints on ultrafine-grained Al and ultrafine-grained Cu revealed significant differences regarding the deformation structure. For ultrafine-grained Cu considerably less activity of grain boundary sliding has been observed compared to ultrafine-grained Al.

Keywords

nanoindentationspherical indentationstrain-rate sensitivityultrafine-grained material
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 8 , 28 April 2017 , pp. 1466 - 1473
Check for updates
Copyright
Copyright © Materials Research Society 2017 

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.)

Footnotes

Contributing Editor: George M. Pharr

b)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

A previous error in this article has been corrected, see 10.1557/jmr.2017.245.

References

REFERENCES

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, 5–8 (2002).Google Scholar
Horita, Z., Ohashi, K., Fujita, T., Kaneko, K., and Langdon, T.G.: Achieving high strength and high ductility in precipitation-hardened alloys. Adv. Mater. 17, 1599–1602 (2005).Google Scholar
Höppel, H.W., May, J., and Göken, M.: Enhanced strength and ductility in ultrafine-grained aluminium produced by accumulative roll bonding. Adv. Eng. Mater. 6, 781–784 (2004).CrossRefGoogle Scholar
Chen, J., Lu, L., and Lu, K.: Hardness and strain rate sensitivity of nanocrystalline Cu. Scr. Mater. 54, 1913–1918 (2006).Google Scholar
May, J., Höppel, H.W., and Göken, M.: Strain rate sensitivity of ultrafine-grained aluminium processed by severe plastic deformation. Scr. Mater. 53, 189–194 (2005).CrossRefGoogle Scholar
Mishra, A., Martin, M., Thadhani, N.N., Kad, B.K., Kenik, E.A., and Meyers, M.A.: High-strain-rate response of ultra-fine-grained copper. Acta Mater. 56, 2770–2783 (2008).CrossRefGoogle Scholar
Maier, V., Durst, K., Mueller, J., Backes, B., Höppel, H., and Göken, M.: Nanoindentation strain-rate jump tests for determining the local strain-rate sensitivity in nanocrystalline Ni and ultrafine-grained Al. J. Mater. Res. 26, 1421–1430 (2011).Google Scholar
Pathak, S., Stojakovic, D., and Kalidindi, S.R.: Measurement of the local mechanical properties in polycrystalline samples using spherical nanoindentation and orientation imaging microscopy. Acta Mater. 57, 3020–3028 (2009).Google Scholar
Pathak, S., Michler, J., Wasmer, K., and Kalidindi, S.R.: Studying grain boundary regions in polycrystalline materials using spherical nano-indentation and orientation imaging microscopy. J. Mater. Sci. 47, 815–823 (2012).Google Scholar
Swadener, J.G., George, E.P., and Pharr, G.M.: The correlation of the indentation size effect measured with indenters of various shapes. J. Mech. Phys. Solids 50, 681–694 (2002).Google Scholar
Sánchez-Martín, R., Zambaldi, C., Pérez-Prado, M.T., and Molina-Aldareguia, J.M.: High temperature deformation mechanisms in pure magnesium studied by nanoindentation. Scr. Mater. 104, 9–12 (2015).Google Scholar
Kalidindi, S.R. and Pathak, S.: Determination of the effective zero-point and the extraction of spherical nanoindentation stress–strain curves. Acta Mater. 56, 3523–3532 (2008).Google Scholar
Hertz, H.: Über die Berührung fester elastischer Körper [The contact of solid elastic bodies]. J. Für Die Reine Und Angew. Math. 1882, 156–171 (1882).Google Scholar
Tabor, D.: The Hardness of Metals (Oxford University Press, London, 1951).Google Scholar
Saito, Y., Utsunomiya, H., Tsuji, N., and Sakai, T.: Novel ultra-high straining process for bulk materials-development of the accumulative roll-bonding (ARB) process. Acta Mater. 47, 579–583 (1999).Google Scholar
Pethica, J.B. and Oliver, W.C.: Mechanical properties of nanometer volumes of material: Use of the elastic response of small area indentations. Mater. Res. Soc. Symp. Proc. 130, 13–23 (1989).CrossRefGoogle Scholar
Herbert, E.G., Pharr, G.M., Oliver, W.C., Lucas, B.N., and Hay, J.L.: On the measurement of stress–strain curves by spherical indentation. Thin Solid Films 398–399, 331–335 (2001).Google Scholar
Juliano, T.F., Vanlandingham, M.R., Weerasooriya, T., and Moy, P.: Extracting stress–strain and compressive yield stress information from spherical indentation (Army Research Lab Final Report, Defense Technical Information Center, Fort Belvoir, 2007).Google Scholar
Basu, S., Moseson, A., and Barsoum, M.W.: On the determination of spherical nanoindentation stress–strain curves. J. Mater. Res. 21, 2628–2637 (2006).CrossRefGoogle Scholar
Chintapalli, R.K., Jimenez-Pique, E., Marro, F.G., Yan, H., Reece, M., and Anglada, M.: Spherical instrumented indentation of porous nanocrystalline zirconia. J. Eur. Ceram. Soc. 32, 123–132 (2012).CrossRefGoogle Scholar
Park, Y.J. and Pharr, G.M.: Nanoindentation with spherical indenters: Finite element studies of deformation in the elastic-plastic transition regime. Thin Solid Films 447–448, 246–250 (2004).CrossRefGoogle Scholar
Liu, Y., Hay, J., Wang, H., and Zhang, X.: A new method for reliable determination of strain-rate sensitivity of low-dimensional metallic materials by using nanoindentation. Scr. Mater. 77, 5–8 (2014).CrossRefGoogle Scholar
Wei, Q., Cheng, S., Ramesh, K.T., and Ma, E.: Effect of nanocrystalline and ultrafine grain sizes on the strain rate sensitivity and activation volume: Fcc versus bcc metals. Mater. Sci. Eng., A 381, 71–79 (2004).Google Scholar
Maier, V., Merle, B., Göken, M., and Durst, K.: An improved long-term nanoindentation creep testing approach for studying the local deformation processes in nanocrystalline metals at room and elevated temperatures. J. Mater. Res. 28, 1177–1188 (2013).CrossRefGoogle Scholar

A correction has been issued for this article:

Errata