Neutron energy spectrum influence on irradiation hardening and microstructural development of tungsten

被引:73
作者
Fukuda, Makoto [1 ]
Kumar, N. A. P. Kiran [2 ]
Koyanagi, Takaaki [2 ]
Garrison, Lauren M. [2 ]
Snead, Lance L. [3 ]
Katoh, Yutai [2 ]
Hasegawa, Akira [1 ]
机构
[1] Tohoku Univ, Sendai, Miyagi 9808579, Japan
[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[3] MIT, Cambridge, MA 02139 USA
关键词
Tungsten; Neutron irradiation; Irradiation hardening; Microstructure; Neutron spectrum effect; HFIR; JMTR; Joyo; W-RE ALLOYS; TEMPERATURE; RHENIUM;
D O I
10.1016/j.jnucmat.2016.06.051
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Neutron irradiation to single crystal pure tungsten was performed in the mixed spectrum High Flux Isotope Reactor (HFIR). To investigate the influences of neutron energy spectrum, the microstructure and irradiation hardening were compared with previous data obtained from the irradiation campaigns in the mixed spectrum Japan Material Testing Reactor (JMTR) and the sodium-cooled fast reactor Joyo. The irradiation temperatures were in the range of similar to 900-similar to 800 degrees C and fast neutron fluences were 0.02-9.00 x 10(25) n/m(2) (E > 0.1 MeV). Post irradiation evaluation included Vickers hardness measurements and transmission electron microscopy. The hardness and microstructure changes exhibited a clear dependence on the neutron energy spectrum. The hardness appeared to increase with increasing thermal neutron flux when fast fluence exceeds 1 x 10(25) n/m(2) (E > 0.1 MeV). Irradiation induced precipitates considered to be chi- and sigma-phases were observed in samples irradiated to > 1 x 10(25) n/m(2) (E > 0.1 MeV), which were pronounced at high dose and due to the very high thermal neutron flux of HFIR. Although the irradiation hardening mainly caused by defects clusters in a low dose regime, the transmutation-induced precipitation appeared to impose additional significant hardening of the tungsten. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:249 / 254
页数:6
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