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

TitleNano-hardness, EBSD analysis and mechanical behavior of ultra-fine grain tungsten for fusion applications as plasma facing material
Publication TypeJournal Article
Year of Publication2018
AuthorsL. Tanure, A. Bakaeva, L. Lapeire, D. Terentyev, M. Vilémová, J. Matejicek, K. Verbeken
JournalSurface and Coatings Technology
Volume355
Pagination252-258
Date Published15/12/2018
KeywordsEBSD, Mechanical behavior, MICROSTRUCTURE, Nano-hardness, texture, Tungsten
Abstract

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.

DOI10.1016/j.surfcoat.2018.01.075
Division

PSI

Department

PMI

PID

8ff98c5b25cdd077a699d6cd492f3867

Alternate TitleSurf. Coat. Technol.

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