Hostname: page-component-8448b6f56d-wq2xx Total loading time: 0 Render date: 2024-04-25T03:44:17.087Z Has data issue: false hasContentIssue false
  • English
  • Français

Variable Elastic-Plastic Properties of the Grain Boundaries and Their Effect on the Macroscopic Flow Stress of Nano-Crystalline Metals

Published online by Cambridge University Press:  31 January 2011

Malgorzata Lewandowska ,
Romuald Dobosz  and
Krzysztof J Kurzydlowski
Malgorzata Lewandowska
Affiliation:
malew@inmat.pw.edu.pl, Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland
Romuald Dobosz
Affiliation:
rdobosz@inmat.pw.edu.pl, Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland
Krzysztof J Kurzydlowski
Affiliation:
kjk@inmat.pw.edu.pl, Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland
Get access

Abstract

The paper reports new experimental results describing properties and microstructure of nanocrystalline metals. Nano- and sub-micron aluminium has been produced by hydrostatic extrusion at ambient tempearture. The structures have been quantified in terms of size of grains and misorientation of the grain boundaries. Different average size of grains, variable normalized width of grain size distribution and changing grain boundary misorientation distribution functions have been revealed depending on processing parameters. The results of the tensile tests showed that the average grain size, grain size distribution and the distribution function of misorientation angles influence the flow stress of obtained nano-metals. In order to explain the observed difference in the properties of nano- and micro-sized aluminium alloys, a Finite Element Method models have been developed, which assumes that both grain boundaries and grain interiors may accommodated elastic and non-linear plastic deformation. These models assumed true geometry of grains (which differed in size and shape). Also, variable mechanical properties of grain boundaries have been taken into account (elastic modulus, yield strength and work hardening rate). The results of modelling explain in a semi-quantitative way macroscopic deformation of nano-crystalline aggregates. In particular, they illustrate the importance of the interplay between properties of grain boundaries and grain interiors in elastic and plastic regime.

Keywords

grain boundariesgrain sizenanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1224: Symposia FF/GG – Mechanical Behavior at Small Scales — Experiments and Modeling , 2009 , 1224-FF10-37
Copyright
Copyright © Materials Research Society 2010

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 Hansen, N., Mat. Sci. Eng. A409, 39–45 (2005)Google Scholar
2 Kurzydlowski, K.J., Ralph, B., Bucki, J.J., Garbacz, A., Mater. Sci. Eng. A205, 127–132 (1996)Google Scholar
3 Schiotz, J., Tolla, F.D. di, Jacobsen, K.W., Nature 391, 561–563 (1998)Google Scholar
4 Masumura, R. A., Hazzledine, P. M. and Pande, C. S., Acta mater. 46, 4527–4534 (1998)Google Scholar
5 Kim, X. S., Estrin, Y., Acta mater. 53, 765–772 (2004)Google Scholar
6 Lewandowska, M., Kurzydlowski, K.J., J. Mat. Sci. 43, 7299–7306 (2008)Google Scholar
7 Wawer, K., Lewandowska, M., Kurzydlowski, K.J., Mat. Sci. Forum 584–586, 541-54 (2008)Google Scholar
8 Lewandowska, M., Pachla, W., Kurzydlowski, K.J., Int. J. Mat. Res. (formely Z.Metallkd) 98, 172–177 (2007)Google Scholar
9 Garbacz, H., Lewandowska, M., Pachla, W., Kurzydlowski, K.J., J Microscopy 223, 272–274 (2006)Google Scholar
10 Lewandowska, M., Krawczynska, A.T., Kulczyk, M., Kurzydlowski, K.J., J. Nucl. Mat. 386-388, 499–502 (2009)Google Scholar
11 Krawczynska, A.T., Lewandowska, M., Kurzydlowski, K.J., Solid State Phenomena 140, 173–178 (2008)Google Scholar
12 Dobosz, R., Wejrzanowski, T., Kurzydlowski, K. J., Computer Methods in Material Science 9, No. 1, (2009)Google Scholar