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Effect of Pulsed Deuterium Plasma Irradiation on Dual-Phase Tungsten High-Entropy Alloys

2022; RELX Group (Netherlands); Linguagem: Inglês

10.2139/ssrn.4047087

1556-5068

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

High-Temperature Coating Behaviors

The morphological and structural changes of dual-phasetungsten specimenswith high entropy alloy (HEA) as a second phase (95% W, 5% of FeNiCuCrMn) are investigated after deuterium plasma irradiation. Heat flux factor of deuterium plasma pulses is comparable to transient events (ELM-s and VDE-s) in ITER. The study shows that use of HEA as a second phase reduces significantly the extent of crack generation in comparison with pure tungsten, and even with 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 thickness of about 50-80 µm which is less than in case of pure tungsten.