Irradiation hardening behaviors of tungsten-potassium alloy studied by accelerated 3-MeV W2+ ions

doi:10.1088/1674-1056/ab75cf

Abstract Tungsten-potassium (WK) alloy with ultrafine/fine grains and nano-K bubbles is fabricated through spark plasma sintering (SPS) and rolling process. In this study, 3-MeV W²⁺ ion irradiation with a tandem accelerator is adopted to simulate the displacement damage caused by neutrons. As the depth of irradiation damage layer is limited to only 500 nm, the hardening behaviors of WK alloy and ITER (International Thermonuclear Experimental Reactor)-W under several damage levels are investigated through Bercovich tip nanoindentation test and other morphological characterizations. The indenter size effect (ISE), soft substrate effect (SSE), and damage gradient effect (DGE) are found to influence the measurement of nano-hardness. Few or no pop-ins in irradiated samples are observed while visible pop-in events take place in unirradiated metals. Extensive pile-up with different morphology features around the indentation exists in both WK and ITER-W. The WK shows a smaller hardness increment than ITER-W under the same condition of displacement damage. This study provides beneficial information for WK alloy serving as a promising plasma facing materials (PFMs) candidate.

Keywords: irradiation harden spark plasma sintering WK alloy nanoindentation

Received: 30 November 2019
Revised: 18 January 2020
Accepted manuscript online:

PACS:	61.80.Jh	(Ion radiation effects)
	52.55.Rk	(Power exhaust; divertors)
	28.52.Fa	(Materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11975160, 11775149, and 11475118) and the International Thermonuclear Experimental Reactor (ITER) Program Special, China (Grant No. 2011GB108005).

Corresponding Authors: Xu-Dong Cui, Jun Tang
E-mail: xudcui@caep.cn;tangjun@scu.edu.cn

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Xiao-Liang Yang(杨晓亮), Long-Qing Chen(陈龙庆), Wen-Bin Qiu(邱文彬), Yang-Yi-Peng Song(宋阳一鹏), Yi Tang(唐毅), Xu-Dong Cui(崔旭东), Chang-Song Liu(刘长松), Yan Jiang(蒋燕), Tao Zhang(张涛), Jun Tang(唐军) Irradiation hardening behaviors of tungsten-potassium alloy studied by accelerated 3-MeV W²⁺ ions 2020 Chin. Phys. B 29 046102

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Irradiation hardening behaviors of tungsten-potassium alloy studied by accelerated 3-MeV W2+ ions

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Irradiation hardening behaviors of tungsten-potassium alloy studied by accelerated 3-MeV W²⁺ ions