Properties of drawn W wire used as high performance fibre in tungsten fibre-reinforced tungsten composite

J. Riesch, J. Almanstötter, J. W. Coenen, M. Fuhr, H. Gietl, Y. Han, T. Höschen, Ch Linsmeier, N. Travitzky, P. Zhao, R. Neu

Research output: Contribution to journalConference articlepeer-review

27 Citations (Scopus)

Abstract

High strength and creep resistance also at high temperature, combined with a high thermal conductivity and high melting point make tungsten (W) an ideal material for highly loaded areas in future fusion reactors. However, as a typical bcc metal tungsten features an intrinsic brittleness up to very high temperature and is prone to operational embrittlement. Tungsten fibre-reinforced tungsten composite (Wf/W) utilizes extrinsic toughening mechanisms similar to ceramic fibre-reinforced ceramics and therefore overcomes the brittleness problem. The properties of the composite are to a large extend determined by the properties of the drawn tungsten wire used as reinforcement fibres. W wire exhibits a superior strength and shows ductile behaviour with exceptional local plasticity. Beside the typical mechanisms observed for ceramic composites the ductile deformation of the fibres is therefore an additional very effective toughening mechanism. Tension tests were used to investigate this phenomenon in more detail. Results show that there is a region of enhanced localized plastic deformation. The specific energy consumption in this region was estimated and used to suggest optimisation options for Wf/W composites.

Original languageEnglish
Article number012043
JournalIOP Conference Series: Materials Science and Engineering
Volume139
Issue number1
DOIs
Publication statusPublished - 2 Sep 2016
Event37th Riso International Symposium on Materials Science - Riso, Denmark
Duration: 5 Sep 20168 Sep 2016

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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