resumo
In this study, CuxCrFeTiV (x = 0.21, 0.44, 1 and 1.7 M ratio) high entropy alloys have been devised for thermal barriers between the plasma facing tungsten tiles and the copper-based heat sink in the first wall of nuclear fusion reactors. The high entropy alloys were produced by ball milling the elemental powders, followed by consolidation with spark plasma sintering. Irradiation of the equiatomic CuCrFeTiV sample was carried out at room temperature with Ai(+) (300 keV) beams with a fluence of 3 x 10(20) at/m(2). Structural changes prior and after irradiation were investigated by scanning electron microscopy, coupled with energy dispersive X-ray spectroscopy, X-ray diffraction and thermal diffusivity. Preliminary results showed the presence of heterogenous and multiphasic microstructures in all samples. Moreover, with the increase of the Cu content it is possible to observe the formation of Cu-rich structures. The diffractogram of the CuCrFeTiV sample revealed major peaks of a BCC crystal structure and minor peaks of a FCC crystal structure. In addition, after irradiation no modifications in the CuCrFeTiV microstructure or in the diffractogram were observed.
palavras-chave
WEAR-RESISTANCE; MICROSTRUCTURE
categoria
Nuclear Science & Technology
autores
Dias, M; Antao, F; Catarino, N; Galatanu, A; Galatanu, M; Ferreira, P; Correia, JB; da Silva, RC; Goncalves, AP; Alves, E
nossos autores
Paula Celeste da Silva Ferreira
Investigador Coordenadoragradecimentos
This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement number 633053. IST activities also received financial support from Fundacao para a Ciencia e Tecnologia through project Pest-OE/SADG/LA0010/2013. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Financial support was also received from the Fundacao para a Ciencia e Tecnologia (FCT) under the PTDC/CTM/100163/2008 grant and the PEST-OE/CTM-UI0084/2011 and UID/Multi/04349/2013 contracts. M. Dias acknowledges the FCT grant SFRH/BPD/68663/2010.