Nano-hardness, EBSD analysis and mechanical behavior of ultra-fine grain tungsten for fusion applications as plasma facing material

Leandro Tanure, Anastasiia Bakaeva, Linsey Lapeire, Dmitry Terentyev, Monika Vilémová, Jiri Matejicek, Kim Verbeken

    Research outputpeer-review


    Tungsten and its alloys have been extensively studied in order to be used in plasma facing components for future fusion nuclear reactors such as ITER and DEMO. In this work, an evaluation of nano-hardness, microstructure/texture and mechanical behavior using nano-indentation, electron backscatter diffraction (EBSD) and tensile test was performed. The investigated materials were ultra-fine grain lab-scale tungsten and ITER-specification commercial tungsten products, taken as reference in the as-received and annealed (at 1300 °C for 1 h) conditions. Three ultra-fine grain (UFG) tungsten grades were produced under different spark plasma sintering conditions, namely at 2000 °C and 70 MPa, at 1700 °C and 80 MPa and, finally, at 1800 °C and 80 MPa. EBSD analysis provides very relevant data as it is known that the crystallographic orientation affects some features of the surface damage caused by fusion-relevant plasma exposure. The present results will serve as a reference for future studies that will be carried out using plasma-exposed samples in order to correlate the observed damage with the microstructural characteristics and mechanical behavior.
    Original languageEnglish
    Pages (from-to)252-258
    Number of pages7
    JournalSurface and Coatings Technology
    StatePublished - 15 Dec 2018
    Event2017 - SMMIB: International Conference on Surface Modification of Materials by Ion Beams - Lisbon
    Duration: 9 Jul 201714 Jul 2017

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