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@ARTICLE{Zhao:836224,
      author       = {Zhao, P. and Riesch, J. and Höschen, T. and Almanstötter,
                      J. and Balden, M. and Coenen, J. W. and Himml, R. and
                      Pantleon, W. and von Toussaint, U. and Neu, R.},
      title        = {{M}icrostructure, mechanical behaviour and fracture of pure
                      tungsten wire after different heat treatments},
      journal      = {International journal of refractory metals $\&$ hard
                      materials},
      volume       = {68},
      issn         = {0263-4368},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-05345},
      pages        = {29 - 40},
      year         = {2017},
      abstract     = {Plastic deformation of tungsten wire is an effective source
                      of toughening tungsten fibre-reinforced tungsten composites
                      (Wf/W) and other tungsten fibre-reinforced composites. To
                      provide a reference for optimization of those composites,
                      unconstrained pure tungsten wire is studied after various
                      heat treatments in terms of microstructure, mechanical
                      behaviour and fracture mode. Recrystallization is already
                      observed at a relatively low temperature of 1273 K due to
                      the large driving force caused by a high dislocation
                      density. Annealing for 30 min at 1900 K also leads to
                      recrystallization, but causes a rather different
                      microstructure. As-fabricated wire and wire recrystallized
                      at 1273 K for 3 h show fine grains with a high aspect ratio
                      and a substantial plastic deformability: a clearly defined
                      tensile strength, high plastic work, similar necking shape,
                      and the characteristic knife-edge-necking of individual
                      grains on the fracture surface. While the wire
                      recrystallized at 1900 K displays large, almost equiaxed
                      grains with low aspect ratios as well as distinct brittle
                      properties. Therefore, it is suggested that a high aspect
                      ratio of the grains is important for the ductile behaviour
                      of tungsten wire and that embrittlement is caused by the
                      loss of the preferable elongated grain structure rather than
                      by recrystallization. In addition, a detailed evaluation of
                      the plastic deformation behaviour during tensile test gives
                      guidance to the design and optimization of tungsten
                      fibre-reinforced composites.},
      cin          = {IEK-4},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000410014600005},
      doi          = {10.1016/j.ijrmhm.2017.06.001},
      url          = {https://juser.fz-juelich.de/record/836224},
}