Sintering and irradiation of copper-based high entropy alloys for nuclear fusion

authors	Dias, M; Antao, F; Catarino, N; Galatanu, A; Galatanu, M; Ferreira, P; Correia, JB; da Silva, RC; Goncalves, AP; Alves, E
nationality	International
journal	FUSION ENGINEERING AND DESIGN
author keywords	High entropy alloys; Microstructure; Irradiation damage; X-ray diffraction
keywords	WEAR-RESISTANCE; MICROSTRUCTURE
abstract	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.
publisher	ELSEVIER SCIENCE SA
issn	0920-3796
isbn	1873-7196
year published	2019
volume	146
beginning page	1824
ending page	1828
digital object identifier (doi)	10.1016/j.fusengdes.2019.03.044
web of science category	Nuclear Science & Technology
subject category	Nuclear Science & Technology
unique article identifier	WOS:000488313700093