Large-Scale Tungsten Fibre-Reinforced Tungsten and Its Mechanical Properties

Preprints.org

Abstract

Tungsten fibre-reinforced tungsten composites (Wf/W) have been in development to overcome the inherent brittleness of tungsten as one of the most promising candidate for the first wall and divertor armour material in a future fusion power plant. As the development of Wf/W continues, the fracture toughness of the composite is one of the main design drivers. In this contribution the efforts on size upscaling of Wf/W based on Chemical Vapour Deposition (CVD) is shown together with fracture mechanical tests of two different size samples of Wf/W produced by CVD. Three-point bending tests according to ASTM E399 for brittle materials were used to get a first estimation of the toughness. A provisional fracture toughness value of up to 346MPam1/2 was calculated for the as-fabricated material. As the material does not show a brittle fracture in the as-fabricated state, the J-Integral approach based on the ASTM E1820 was additionally applied for this state. A maximum value of the J-integral of 41kJ/m2 (134,8MPam1/2) was determined for the largest samples. Post mortem investigations were employed to detail the active mechanisms and crack propagation.

Authors 10

1. Daniel Schwalenberg

   Forschungszentrum Jülich · Technical University of Munich

   Affiliation as printed

   Forschungszentrum Jülich GmbH , Institut für Energie-und Klimaforschung , 52425 Juelich , Germany;

   Technische Universität München , 85748 Garching , Germany;

   Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung, 52425 Juelich, Germany;

   Technische Universität München, 85748 Garching, Germany;

2. J.W. Coenen corresponding

   University of Wisconsin–Madison · Forschungszentrum Jülich

   Affiliation as printed

   Department of Engineering Physics , University of Wisconsin -Madison , Madison , WI 53706 , USA

   Forschungszentrum Jülich GmbH , Institut für Energie-und Klimaforschung , 52425 Juelich , Germany;

   Department of Engineering Physics, University of Wisconsin -Madison, Madison, WI 53706, USA

   Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung, 52425 Juelich, Germany;

3. J. Riesch

   Max Planck Institute for Plasma Physics

   Affiliation as printed

   Max-Planck-Institut für Plasmaphysik , 85748 Garching , German;

   Max-Planck-Institut für Plasmaphysik, 85748 Garching, German;

4. T. Höschen

   Max Planck Institute for Plasma Physics

   Affiliation as printed

   Max-Planck-Institut für Plasmaphysik , 85748 Garching , German;

   Max-Planck-Institut für Plasmaphysik, 85748 Garching, German;

5. Y. Mao

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH , Institut für Energie-und Klimaforschung , 52425 Juelich , Germany;

   Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung, 52425 Juelich, Germany;

6. Alexander Lau

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH , Institut für Energie-und Klimaforschung , 52425 Juelich , Germany;

   Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung, 52425 Juelich, Germany;

7. Hanns Giet

   Idaho National Laboratory

   Affiliation as printed

   Fusion Safety Program, Idaho National Laboratory,Idaho Falls,ID 83412 USA;

8. Leonard Raumann

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH , Institut für Energie-und Klimaforschung , 52425 Juelich , Germany;

   Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung, 52425 Juelich, Germany;

9. Ch. Linsmeier

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH , Institut für Energie-und Klimaforschung , 52425 Juelich , Germany;

   Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung, 52425 Juelich, Germany;

10. R. Neu

    University of Wisconsin–Madison · Technical University of Munich

    Affiliation as printed

    Department of Engineering Physics , University of Wisconsin -Madison , Madison , WI 53706 , USA

    Technische Universität München , 85748 Garching , Germany;

    Department of Engineering Physics, University of Wisconsin -Madison, Madison, WI 53706, USA

    Technische Universität München, 85748 Garching, Germany;