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Study of Deformation Behavior of Ultrafine-grained Materials Through in Situ Nanoindentation in a Transmission Electron Microscope

Published online by Cambridge University Press:  01 July 2005

M. Jin ,
A.M. Minor ,
D. Ge  and
J.W. Morris Jr.
M. Jin
Affiliation:
Department of Materials Science and Engineering, University of California, Berkeley, California 94720
A.M. Minor
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720
D. Ge
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720
J.W. Morris Jr.*
Affiliation:
Department of Materials Science and Engineering, University of California, Berkeley, California 94720
*
a) Address all correspondence to this author. e-mail: jwmorris@berkeley.edu
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Abstract

The mechanical properties of ultrafine-grained and nanograined materials have received a great deal of recent attention because of their unusual and promising values. However, some of the most important mechanisms of deformation remain unclear. In this work, the deformation behavior of ultrafine-grained Al films and ultrafine-grained Fe is studied through in situ nanoindentation in a transmission electron microscope. Deformation-induced coarsening by grain boundary migration was observed in the ultrafine-grained Al films during deformation at room temperature, whereas no grain boundary motion was found in ultrafine-grained Fe. The lack of grain boundary motion in Fe was attributed to the pinning effect of nano-sized particles at the Fe grain boundaries.

Keywords

Grain boundariesNanoindentationTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 7 , July 2005 , pp. 1735 - 1740
Copyright
Copyright © Materials Research Society 2005

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