Paper Title:
Local Investigations of the Mechanical Properties of Ultrafine Grained Metals by Nanoindentations
  Abstract

The mechanical properties of ultrafine-grained metals processed by equal channel angular pressing is investigated by nanoindentations in comparison with measurements on nanocrystalline nickel with a grain size between 20 and 400 nm produced by pulsed electrodeposition. Besides hardness and Young’s modulus measurements, the nanoindentation method allows also controlled experiments on the strain rate sensitivity, which are discussed in detail in this paper. Nanoindentation measurements can be performed at indentation strain rates between 10-3 s-1 and 0.1 s-1. Nanocrystalline and ultrafine-grained fcc metals as Al and Ni show a significant strain rate sensitivity at room temperature in comparison with conventional grain sized materials. In ultrafine-grained bcc Fe the strain rate sensitivity does not change significantly after severe plastic deformation. Inelastic effects are found during repeated unloading-loading experiments in nanoindentations.

  Info
Periodical
Materials Science Forum (Volumes 503-504)
Edited by
Zenji Horita
Pages
31-36
DOI
10.4028/www.scientific.net/MSF.503-504.31
Citation
J. Mueller, K. Durst, D. Amberger, M. Göken, "Local Investigations of the Mechanical Properties of Ultrafine Grained Metals by Nanoindentations", Materials Science Forum, Vols. 503-504, pp. 31-36, 2006
Online since
January 2006
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Price
$32.00
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