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Journal of Materials Science

, Volume 41, Issue 19, pp 6228–6236 | Cite as

Thermal expansion behaviour of ultra-high modulus carbon fibre reinforced magnesium composite during thermal cycling

  • M. Russell-Stevens
  • R. I. Todd
  • M. Papakyriacou
Article

Abstract

The thermally induced strain response of unidirectional P100S/AZ91D carbon fibre-reinforced magnesium composite was studied over five cycles in the ±100 °C temperature range. A temperature-dependent one-dimensional model was employed to predict the anticipated response to the cycling thermal environment. Strain hysteresis was observed during cycling and attributed to matrix yielding. First cycle residual plastic strains were modelled with reasonable agreement. Experimental results deviated from predictions during subsequent cycles with continued thermal ratcheting shifting the hysteresis loops to higher strains with increasing cycles. This was thought to be associated with interfacial debonding and frictional sliding at fibre/matrix interfaces. The effect of thermal treatment on composite expansion behaviour was investigated and the results discussed in terms of minimising thermally induced deformations during anticipated service conditions. Treatments were found to affect the first cycle behaviour, reducing in particular residual plastic strain generation. Matrix yield strength was exceeded over the thermal cycle due to a lack of sufficient hardening, and since interfacial conditions were unaltered, interfacial sliding and thermal ratcheting could not be eliminated. The potential for improvement of C/Mg composite thermal strain response was explored in the light of the current findings.

Keywords

Thermal Cycle Thermal Strain Discontinuous Precipitate Fibre Matrix Interface Thermal Expansion Behaviour 

Notes

Acknowledgements

The authors wish to thank P. Allen, Hexcel Composites, Duxford, England for kindly allowing the use of the Linseis cryogenic dilatometer and J. Reiter (LKR) for the fabrication of C/Mg specimens. Thanks are also due to P. Schulz (LKR) for his valuable discussions.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • M. Russell-Stevens
    • 1
  • R. I. Todd
    • 1
  • M. Papakyriacou
    • 2
  1. 1.Department of MaterialsUniversity of OxfordOxfordEngland
  2. 2.ARC Leichtmetall-Kompetenzzentrum Ranshofen GmbH, AMAG-FVA-GebäudeRanshofenAustria

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