Skip to main content
×
Home
    • Aa
    • Aa

Effect of microstructural heterogeneity on the mechanical behavior of nanocrystalline metal films

  • Jagannathan Rajagopalan (a1) and M. Taher A. Saif (a1)
Abstract
Abstract

Conventionally, mean grain size is considered the most critical microstructural parameter in determining the mechanical behavior of pure metals. By systematically controlling the distribution of grain orientations in aluminum films, we show that microstructural heterogeneity alone induces large variation in the mechanical behavior of nanocrystalline metal films. Aluminum films with relatively homogeneous microstructure (all grains with identical out-of-plane orientation) show substantially less early Bauschinger effect compared to films with heterogeneous microstructure, irrespective of film thickness or grain size. On the other hand, the films with homogeneous microstructure show relatively higher yield stresses. A direct correspondence is found between the nonuniformity of plastic deformation and early Bauschinger effect, which confirms the critical role of microstructural heterogeneity.

Copyright
Corresponding author
a)Address all correspondence to this author. e-mail: saif@illinois.edu
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

1. E.O. Hall : The deformation and ageing of mild steel: III. Discussion of results. Proc. Phys. Soc. B 64(9), 747 (1951).

3. K.S. Kumar , H. Van Swygenhoven , and S. Suresh : Mechanical behavior of nanocrystalline metals and alloys. Acta Mater. 51, 5743 (2003).

4. H. Van Swygenhoven and J.R. Weertman : Deformation in nanocrystalline metals. Mater. Today 9, 24 (2006).

9. R. Schwaiger , B. Moser , M. Dao , N. Chollacoop , and S. Suresh : Some critical experiments on the strain-rate sensitivity of nanocrystalline nickel. Acta Mater. 51, 5159 (2003).

11. K. Zhang , J.R. Weertman , and J.A. Eastman : Rapid stress-driven grain coarsening in nanocrystalline cu at ambient and cryogenic temperatures. Appl. Phys. Lett. 87, 061921 (2005).

12. D.S. Gianola , S. Van Petegem , M. Legros , S. Brandstetter , H. Van Swygenhoven , and K.J. Hemker : Stress-assisted discontinuous grain growth and its effect on the deformation behavior of nanocrystalline aluminum thin films. Acta Mater. 54, 2253 (2006).

16. E. Bitzek , P.M. Derlet , P.M. Anderson , and H. Van Swygenhoven : The stress–strain response of nanocrystalline metals: A statistical analysis of atomistic simulations. Acta Mater. 56, 4846 (2008).

18. X. Li , Y. Wei , W. Yang , and H. Gao : Competing grain-boundary-and dislocation-mediated mechanisms in plastic strain recovery in nanocrystalline aluminum. Proc. Natl. Acad. Sci. U.S.A. 106, 16108 (2009).

19. I. Lonardelli , J. Almer , G. Ischia , C. Menapace , and A. Molinari : Deformation behavior in bulk nanocrystalline-ultrafine aluminum: In situ evidence of plastic strain recovery. Scr. Mater. 60, 520 (2009).

20. H. Niwa and M. Kato : Epitaxial growth of Al on Si (001) by sputtering. Appl. Phys. Lett. 59, 543 (1991).

21. J.H. Han and M.T.A. Saif : In situ microtensile stage for electromechanical characterization of nanoscale freestanding films. Rev. Sci. Instrum. 77, 045102 (2006).

23. J. Rajagopalan , J.H. Han , and M.T.A. Saif : Bauschinger effect in unpassivated freestanding nanoscale metal films. Scr. Mater. 59, 734 (2008).

24. S.P. Baker , A. Kretschmann , and E. Arzt : Thermomechanical behavior of different texture components in cu thin films. Acta Mater. 49, 2145 (2001).

25. N. Christodoulou , O.T. Woo , and S.R. Macewen : Effect of stress reversals on the work hardening behaviour of polycrystalline copper. Acta Metall. 34, 1553 (1986).

29. B. Zhu , R.J. Asaro , P. Krysl , and R. Bailey : Transition of deformation mechanisms and its connection to grain size distribution in nanocrystalline metals. Acta Mater. 53, 4825 (2005).

30. B. Zhu , R.J. Asaro , P. Krysl , and R. Bailey : Effects of grain size distribution on the mechanical response of nanocrystalline metals: Part II. Acta Mater. 54, 3307 (2006).

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords:

Metrics

Full text views

Total number of HTML views: 5
Total number of PDF views: 14 *
Loading metrics...

Abstract views

Total abstract views: 66 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 23rd June 2017. This data will be updated every 24 hours.