Self-protection Performance of Nano-fuzz Formed on W-plate Surface Due to He+ Irradiation

doi:10.11901/1005.3093.2019.196

Chinese Journal of Materials Research

2019, Vol. 33

Issue (11): 809-814 DOI: 10.11901/1005.3093.2019.196

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Self-protection Performance of Nano-fuzz Formed on W-plate Surface Due to He⁺ Irradiation

WU Liang,FAN Hongyu(

),NI Weiyuan(

),XU Yang,BAO Sen,ZHANG Yuwei,ZHOU Siqian,NIU Jinhai

School of Physics and Material Engineering, Dalian Minzu University, Dalian 116600, China

Cite this article:

WU Liang,FAN Hongyu,NI Weiyuan,XU Yang,BAO Sen,ZHANG Yuwei,ZHOU Siqian,NIU Jinhai. Self-protection Performance of Nano-fuzz Formed on W-plate Surface Due to He⁺ Irradiation. Chinese Journal of Materials Research, 2019, 33(11): 809-814.

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Abstract

Polycrystalline tungsten (W) plate has been irradiated with low-energy (200 eV) and large-flux He⁺ with the fluences of 1.0×10²⁵-1.0×10²⁶ ions/m² at elevated temperatures of 1023 K and 1373 K in a vacuum chamber of 30 Pa. The mass loss, surface morphology and defects distribution of irradiated W plate were characterized by means of weighing method, scanning electron microscope and conductive atomic force microscope. The results show that the erosion rate of cellular- or nano-fuzz-like areas is lower than 30% of that for the smooth areas on W plate surface. W nano-fuzz can keep the sputtered W atoms from escaping from the surface during large-flux He⁺ irradiation. The W nano-fuzz can act as a self-protective barrier on W-surface against the strong surface erosion under ITER relevant He⁺ irradiation conditions.

Key words: metallography tungsten nano-filaments irradiation self-protection

Received: 12 April 2019

ZTFLH:

TG14

Fund: National Natural Science Foundation of China(11405023);National Natural Science Foundation of China(21573035);Natural Science Foundation of Liaoning Province(20180510006);Dalian Science and Technology Star Project(2017RQ149);National College Students Innovation Training Project of China(G201912026057);“Taiyangniao” Student Research Project of Dalian Minzu University(2019287)

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	Liang WU
	Hongyu FAN
	Weiyuan NI
	Yang XU
	Sen BAO
	Yuwei ZHANG
	Siqian ZHOU
	Jinhai NIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.196 OR https://www.cjmr.org/EN/Y2019/V33/I11/809

Fig.1 Typical SEM images of polycrystalline W irradiated at the fluences of 1.0×10²⁵ions/m² (a), 3.0×10²⁵ions/m² (b), 6.0×10²⁵ions/m²(c) and 1.0×10²⁶ions/m² at 1023 K (d)

Fig.2 Typical SEM images of polycrystalline W irradiated at the fluences of 1.0×10²⁵ions/m² (a), 3.0×10²⁵ions/m²(b), 6.0×10²⁵ions/m²(c) and 1.0×10²⁶ions/m² at 1023 K (d)

Fig.3 Typical cross-sectional SEM view (a) of polycrystalline W irradiated at temperature of 1373 K and at He⁺ fluence of 1.0×10²⁶ ions/m² and the thickness of cellular or fuzzy layers as a function of He⁺ fluence (b)

Fig.4 CAFM analysis the surface topography (left) and the simultaneously measured current images (right) of W irradiated with different He ion fluencies at 1023 K (a) 3.0×10²⁵ ions/m², (b) 6.0×10²⁵ions/m²，(c) 1.0×10²⁶ ions/m²

Fig.5 Mass loss (a) and sputtering yields (b) of irradiated W as a function of He ions fluencies

Fig.6 Schematic representation of the self-protective mechanism of W nanostuctured layer via He plasma irradiation

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