Blistering and Helium Retention of Tungsten and 5% Chromium Doped Tungsten Exposed to 60keV Helium Ions Irradiation

doi:10.1088/0256-307X/35/12/126101

Chin. Phys. Lett.

2018, Vol. 35

Issue (12): 126101 DOI: 10.1088/0256-307X/35/12/126101

CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES

Blistering and Helium Retention of Tungsten and 5% Chromium Doped Tungsten Exposed to 60keV Helium Ions Irradiation

Shu-qin Lv¹, Wen-jia Han¹, Jian-gang Yu¹, Hang Zhou¹, Mi Liu^1,2, Chang-an Chen³, Kai-gui Zhu^1,2**

¹Department of Physics, Beihang University, Beijing 100191
²Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics, Beihang University, Beijing 100191
³Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621907

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Shu-qin Lv, Wen-jia Han, Jian-gang Yu et al 2018 Chin. Phys. Lett. 35 126101

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Abstract Pure tungsten (W) and chromium doped W (W-5%Cr) are prepared by powder metallurgy. The microstructure, blistering and helium retention are investigated by x-ray diffraction, scanning electron microscopy, transmission electron microscopy and thermal desorption spectroscopy (TDS). These results show that the average size and density of helium blisters on the surface of pure W are much larger than those on the W-5%Cr alloy. Vacancy-impurity pairs can reduce the migration coefficients of vacancy and vacancy-helium complexes, and Cr may play a role of such an impurity. Moreover, the TDS result shows that the highest desorption peak moves to higher temperature, which is attributed to the He$_{m}$Cr$_{k}$V$_{n}$ complexes in the W-Cr alloy. In addition, the helium retention is found to be higher in W than in W-5%Cr.

Received: 18 July 2018 Published: 23 November 2018

PACS:	61.66.Dk	(Alloys )
	61.05.-a	(Techniques for structure determination)
	65.90.+i	(Other topics in thermal properties of condensed matter)
	28.52.Fa	(Materials)
	52.40.Hf	(Plasma-material interactions; boundary layer effects)

Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51471015 and 11675010, and the National Magnetic Confinement Fusion Program under Grant No 2015GB109003.

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https://cpl.iphy.ac.cn/10.1088/0256-307X/35/12/126101 OR https://cpl.iphy.ac.cn/Y2018/V35/I12/126101

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	Shu-qin Lv
	Wen-jia Han
	Jian-gang Yu
	Hang Zhou
	Mi Liu
	Chang-an Chen
	Kai-gui Zhu

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