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

0498240 - ÚFP 2019 RIV CH eng J - Journal Article
Tanure, L. - Bakaeva, A. - Lapeire, L. - Terentyev, D. - Vilémová, Monika - Matějíček, Jiří - Verbeken, K.
Nano-hardness, EBSD analysis and mechanical behavior of ultra-fine grain tungsten for fusion applications as plasma facing material.
Surface and Coatings Technology. Roč. 355, December 15 (2018), s. 252-258. ISSN 0257-8972.
[International Conference on Surface Modification of Materials by Ion Beams. Lisbon, 09.07.2017-14.07.2017]
R&D Projects: GA ČR(CZ) GA17-23154S
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : tungsten * EBSD * nano-hardness * microstructure * texture * mechanical behavior
OECD category: Materials engineering
Impact factor: 3.192, year: 2018
https://www.sciencedirect.com/science/article/pii/S0257897218300902?via%3Dihub

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 degrees C for 1 h) conditions. Three ultra-fine grain (UFG) tungsten grades were produced under different spark plasma sintering conditions, namely at 2000 degrees C and 70 MPa, at 1700 degrees C and 80 MPa and, finally, at 1800 degrees 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.
Permanent Link: http://hdl.handle.net/11104/0290628