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Volume 42 Issue 9
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(9): 1999-2007.
DING Dan, ZHANG Ying, YUAN Yue, et al. Surface cracking and melting behavior of tungsten-vanadium alloys under thermal shock[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(9): 1999-2007. doi: 10.13700/j.bh.1001-5965.2015.0597(in Chinese)
Citation: DING Dan, ZHANG Ying, YUAN Yue, et al. Surface cracking and melting behavior of tungsten-vanadium alloys under thermal shock[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(9): 1999-2007. doi: 10.13700/j.bh.1001-5965.2015.0597(in Chinese)
shu

Surface cracking and melting behavior of tungsten-vanadium alloys under thermal shock

doi: 10.13700/j.bh.1001-5965.2015.0597
  • 1.

    School of Physics and Nuclear Energy Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • 2. Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beijing University of Aeronautics and Astronautics, Beijing 10008

  • 3. Southwestern Institute of Physics, Chengdu 610041, China

  • 4. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Funds:

the Special Plan of Ministory of Science and Technology of the International Thermonuclear Experimental Reactor (2013GB109003); the Fundamental Research Funds for the Central Universities (5010000201511901) 

  • Received Date: 14 Sep 2015
  • Publish Date: 20 Sep 2016
    Abstract
  • Surface cracking and melting behavior of tungsten-vanadium (W-V) alloys prepared by mechanical alloying + hot pressing (HP) sintering under thermal shock has been investigated in this paper. Mass fraction of V in the alloy is taken as a variable to explore the effect of mass fraction of V (1%-10%) on thermal shock resistance of W-V alloys. A variety of test methods such as optical microscope, scanning electron microscope, energy disperse spectrometer, and nano indentation are used to analyze the structure characteristics of W-V alloys produced by HP sintering, and the characteristics of surface cracking and melting behavior of W-V alloys under thermal shock. Results show that under the conditions of 1 800℃ and 20 MPa，and with heat preservation for 2 h, W-V alloys with high density and high alloying degree can be produced. Moreover, with the increase of vanadium content, the density of W-V alloys increases. In the alloys, the hardness of tungsten matrix is bigger than vanadium rich phase, and therefore, tungsten matrix's ability of preventing the crack growth is obviously greater than vanadium rich phase, when exposed to thermal shock in international thermonuclear experimental reactor (ITER) edge localized modes (ELMs) which are simulated by high energy electron beam; with the increase of vanadium content, the cracking threshold and melting threshold both decrease. The underlying mechanism is discussed detailed in this paper.

     

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