期刊论文详细信息
JOURNAL OF NUCLEAR MATERIALS 卷:479
Neutron energy spectrum influence on irradiation hardening and microstructural development of tungsten
Article
Fukuda, Makoto1  Kumar, N. A. P. Kiran2  Koyanagi, Takaaki2  Garrison, Lauren M.2  Snead, Lance L.3  Katoh, Yutai2  Hasegawa, Akira1 
[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;   
DOI  :  10.1016/j.jnucmat.2016.06.051
来源: Elsevier
PDF
【 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.

【 授权许可】

Free   

【 预 览 】
附件列表
Files Size Format View
10_1016_j_jnucmat_2016_06_051.pdf 1050KB PDF download
  文献评价指标  
  下载次数:2次 浏览次数:1次