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@ARTICLE{Coenen:866495,
      author       = {Coenen, J. W. and Mao, Y. and Sistla, S. and Riesch, J. and
                      Hoeschen, T. and Broeckmann, Ch. and Neu, R. and Linsmeier,
                      Ch.},
      title        = {{I}mproved pseudo-ductile behavior of powder metallurgical
                      tungsten short fiber-reinforced tungsten ({W}/{W})},
      journal      = {Nuclear materials and energy},
      volume       = {15},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2019-05597},
      pages        = {214 - 219},
      year         = {2018},
      abstract     = {For the first wall of a fusion reactor unique challenges on
                      materials in extreme environments require advanced features
                      in areas ranging from mechanical strength to thermal
                      properties. The main challenges include wall lifetime,
                      erosion, fuel management and overall safety. For the
                      lifetime of the wall material, considerations of thermal
                      fatigue due to transient heat loading are crucial as severe
                      mechanical and thermal loads during operation are
                      expected.Tungsten (W) is the main candidate material for the
                      first wall of a fusion reactor as it is resilient against
                      erosion, has the highest melting point of any metal and
                      shows rather benign transmutation behavior under neutron
                      irradiation. However, Tungsten has an issue related to
                      intrinsic brittleness as well as operational embrittlement.
                      To overcome this, a W-fiber enhanced W-composite material
                      (Wf/W) incorporating extrinsic toughening mechanisms has
                      been developed. Recently progress has been made in the
                      powder metallurgical routes towards fully dense multi
                      short-fiber Wf/W. For reasonable performance with respect to
                      mechanical properties and hydrogen retention a fully dense
                      pseudo-ductile Wf/W with is crucial. The properties of the
                      used fibres are crucial. For the composite mechanisms to
                      work a level of strength of the used fibres is required. In
                      this contribution the change in ductility of the fibres is
                      studied.In this contribution it is shown that excluding or
                      minimising the impact of carbon impurities during the
                      sintering process can significantly improve the mechanical
                      properties of the fibres. New test results on the behaviour
                      of PM Wf/W with and without a diffusion barrier during the
                      sintering show a clear benefit as the fibres can retain
                      ductility. Not the grain growth during sintering but the
                      carbon present during sintering is clearly identified as
                      determining the mechanical properties of the fibres.
                      Previous article in issue},
      cin          = {IEK-4},
      ddc          = {624},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000435611400036},
      doi          = {10.1016/j.nme.2018.05.001},
      url          = {https://juser.fz-juelich.de/record/866495},
}