Migration of rhenium and osmium in tungsten

Suzudo, Tomoaki ; Hasegawa, Akira*

Under neutron irradiation Re and Os are produced in W crystals, which are candidate materials for future fusion devices. These impurities are precipitated even under their solid solution limits, i.e. radiation induced precipitation (RIP) occurs. In the present study, we investigated the diffusions of Re and Os in W, which are essential to the development of the RIP. We found that Re and Os formed mixed dumbbells that rotate very easily, and that these dumbbells have 3D motions which are expected to suppress the cavity formation. This may be the explanation of the experimental fact that Re or Os inclusion in W crystals suppress the cavity formation.

Language	:	English
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Meeting title	:	2014 Joint ICTP-IAEA Conference on Models and Data for Plasma-Material Interaction in Fusion Devices
Held date	:	2014/11
Location (city)	:	Trieste
Location (country)	:	Italy
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Keywords	:	タングステン; 照射誘起析出; 第一原理計算手法; 溶質原子拡散
Research Facility	:	大型計算機・スパコン(東海)
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Registration No. : BB20142550
JAEA Abstracts No. :
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