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Effect of pulsed deuterium plasma irradiation on dual-phase tungsten high-entropy alloys

2022; Elsevier BV; Volume: 183; Linguagem: Inglês

10.1016/j.fusengdes.2022.113260

1873-7196

Siim Tõkke, T. Laas, J. Priimets, Marek Tarraste, Valdek Mikli, Maksim Antonov,

Fusion materials and technologies

The morphological and structural changes of dual-phase tungsten specimens with high entropy alloy (HEA) as a second phase (95% W, 5% of FeNiCuCrMn) are investigated after deuterium plasma irradiation. The heat flux factor of deuterium plasma pulses is comparable to transient events (ELM-s and VDE-s) in ITER. The study shows that the use of HEA as a second phase reduces significantly the extent of crack generation in comparison with pure tungsten, and even with a dual-phase alloy of W and FeNi as a second phase. The hardness of W-HEA depends on the manufacturing method (spark plasma sintering, or pressure-less sintering) and is comparable with spark plasma sintered pure tungsten. The layer with decreased hardness is present after irradiation and has a thickness of about 50–80 µm which is less than in the case of pure tungsten.