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From Crystalline to Glassy: Crack Propagation Modes in Decagonal Quasicrystals

Published online by Cambridge University Press:  01 February 2011

Christoph Rudhart ,
Peter Gumbsch  and
Hans-Rainer Trebin
Christoph Rudhart
Affiliation:
Institut für Theoretische und Angewandte Physik, Universität Stuttgart, D-70550 Stuttgart, Germany
Peter Gumbsch
Affiliation:
Institut für Zuverlässigkeit von Bauteilen und Systemen, Universität Karlsruhe, D-76131 Karlsruhe, Germany Fraunhofer Institut für Werkstoffmechanik, D-79194 Freiburg, Germany
Hans-Rainer Trebin
Affiliation:
Institut für Theoretische und Angewandte Physik, Universität Stuttgart, D-70550 Stuttgart, Germany
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Abstract

The propagation of mode-I cracks in a two-dimensional decagonal model quasicrystal is studied by molecular dynamics simulations. The samples are endowed with an atomically sharp seed crack and a temperature gradient. Subsequently the crack is loaded by linear scaling of the displacement field. The response of the crack running into regions of increasing temperature is monitored.

For low temperatures below 30% of the melting temperature Tm the model-quasicrystal fails by brittle fracture. We observe that the crack follows the path of dislocations nucleated at its tip. The crack propagates along well defined planes and circumvents tightly bound clusters. In the medium temperature regime from 30% to 70% Tm the crack is blunting spontaneously by dislocation emission. In the range of 70%-80% Tm the quasicrystal fails by nucleation, growth and coalescence of micro-voids. This gradual, dislocation-free crack extension is caused by plastic deformation which is mediated by localized rearrangements comparable to so-called shear transformation zones in amorphous solids.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 805: Symposium LL – Quasicrystals , 2003 , LL9.2
Copyright
Copyright © Materials Research Society 2004

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References

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