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Post time: 11/17/2014 10:40:11 PM
Tungsten materials for hydrogen helium plasma research eligible Progress bubble formation

Recently, Chinese Science Institute of solid state physics and Material Science Research Institute of Hefei internal friction and defects in solids laboratory researchers and Hefei Institute of Plasma Physics Research Institute and the University of Science & Technology China researchers in cooperation, plasma facing material tungsten in hydrogen and helium study of bubble nucleation and growth mechanism has made new progress, related research results were published in authoritative journals fusion field "nuclear fusion" (nuclearfusion) on.

Body centered cubic tungsten has very high melting point, good anti neutron irradiation and anti sputter etching etc., was chosen as the International Thermonuclear Experimental Reactor (ITER) plasma facing material. From the core plasma (D-T fusion reaction) behavior of the hydrogen isotope and helium ions in materials often leads to the failure of plasma facing materials. Study on the nucleation and growth mechanism of hydrogen and helium bubble of tungsten in the use of density functional theory methods of scientific research personnel, found that the hydrogen atom is difficult to gather in the gap position of tungsten, and helium atoms tend to tungsten (110) between the layers together to form a single layer structure of closely packed (see Figure 1). The calculated binding energies further proves the possibility of the formation of monolayer structure (see Figure 2). Helium monolayer may be experimentally observed on a flat initial configuration of helium bubbles. Because the local stress exists when the helium atom number more than 5, helium monolayer neighbor may launch a self interstitial atoms on the Fraenkel defect.

In addition, based on the law of mass reaction (thelawofmassaction), the concentration of hydrogen vacancy complex temperature dependence of scientific research personnel calculation (see Figure 3), the results show that in the service temperature of ITER (1000K) near the complex vacancy - hydrogen exists in a large amount, compared with empty bit - helium is more stable. Studies also show that aggregation of hydrogen and helium in the vacancy of promote the combination between the vacancy and vacancy. Therefore, hydrogen and helium bubble through the following two ways of nucleation and growth: (1) the vacancy trapping helium atom, when the concentration of helium atoms around the vacancy emission threshold is reached, a self interstitial atom, grew up in the recapture of helium atom vacancy formation of self interstitial atom until the re emission of helium bubbles. (2) hydrogen and helium atoms in the vacancy in, promote vacancy aggregation to form the vacancy clusters, while the hydrogen and helium in the vacancy cluster aggregation leading to the formation of hydrogen and helium bubble. The research results for the understanding of plasma facing materials of hydrogen and helium and hydrogen helium bubble behavior formation mechanism provides the new ideas. Related research results were published in nuclearfusion54103007 (2014).


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