Effect of liquid lithium on the structure and strength of refractory metals

Lyutyi, E. M.; Eliseeva, O. I.; Bobyk, R. I.

doi:10.1007/bf00720644

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…An effect is herein hypothesized in which Li-Mo bonding leads to an "effective binding energy" on the Li surface that exceeds the surface binding energy of pure Li. In addition to chemical cohesion, Li is also capable of penetration into molybdenum along grain boundaries [42] and formation of Li-Mo-O compounds [43]. Recent surface science laboratory experiments [44] have demonstrated that material mixing occurs between Li and TZM Mo at a depth exceeding 10 monolayers (3 nm) as inferred from thermal desorption spectroscopy (TDS) measurements.…”

Section: Resultsmentioning

confidence: 99%

Erosion of lithium coatings on TZM molybdenum and graphite during high-flux plasma bombardment

Abrams¹,

Jaworski²,

Kaita³

et al. 2014

Fusion Engineering and Design

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The rate at which Li films will erode under plasma bombardment in the NSTX-U divertor is currently unknown. It is important to characterize this erosion rate so that the coatings can be replenished before they are completely depleted. An empirical formula for the Li erosion rate as a function of deuterium ion flux, incident ion energy, and Li temperature was developed based on existing theoretical and experimental work. These predictions were tested on the Magnum-PSI linear plasma device capable of ion fluxes > 10 24 m -2 s -1 , ion energies of 20 eV and Li temperatures > 800 °C. Li-coated graphite and TZM molybdenum samples were exposed to a series of plasma pulses during which neutral Li radiation was measured with a fast camera. The total Li erosion rate was inferred from measurements of Li-I emission. The measured erosion rates are significantly lower than the predictions of the empirical formula. Strong evidence of fast Li diffusion into graphite substrates was also observed.

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Section: Resultsmentioning

confidence: 99%

Erosion of lithium coatings on TZM molybdenum and graphite during high-flux plasma bombardment

Abrams¹,

Jaworski²,

Kaita³

et al. 2014

Fusion Engineering and Design

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“…In this case, the admixture dissolves in the solid metal [4,5], and a new phase forms and grows on its surface due to the interaction of the solid and liquid phases [6][7][8][9]. This can be a binary compound (oxide, nitride, or carbide) which, under certain conditions of the tests, inhibits corrosion processes, or this can be a complex ternary compound with a liquid metal component (MexNayOz, MexLiyN z, etc.)…”

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confidence: 99%

A physicomathematical model of corrosion of iron in a lead melt with an admixture of oxygen

Matychak¹,

Fedirko²,

Pavlyna³

et al. 1999

Mater Sci

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We propose a physicomathematical model for the corrosion of iron in a lead melt which contains oxygen. The model allows one do describe the distinct features and regularities of the kinetics of corrosion processes taking into account the multiphase and multicomponent nature of the system and the interaction of components during the processes of adsorption and diffusion. To adequately describe the phenomena under study when formulating the diffusion boundary-value problem, we used nonstationary conditions, which represent correlation surface physicochemical effects, for mass transfer through the interface.Liquid metal corrosion consists mainly in the dissolution of the components of a solid alloy in a liquid metal either in monatomic state [1] or in the form of complex compounds with nonmetallic admixtures (O, N, C) dissolved in the melt [2,3]. In other words, we have the flow of components of the alloy through the interface and their further diffusion into the melt in the monatomic or ionic state under conditions of thermal or concentration mass transfer.With high aCtivity of the nonmetallic admixture, however, its flow to the hard metal-liquid interface can be more intense than the counterflow of ions of the dissolved metal. In this case, the admixture dissolves in the solid metal [4,5], and a new phase forms and grows on its surface due to the interaction of the solid and liquid phases [6][7][8][9]. This can be a binary compound (oxide, nitride, or carbide) which, under certain conditions of the tests, inhibits corrosion processes, or this can be a complex ternary compound with a liquid metal component (MexNayOz, MexLiyN z, etc.) which usually favors the penetration of a melt to the solid metal matrix. The physical and mathematical models, which give a good description for various kinds of dissolution of a metal in the liquid phase, fully ignore the process of phase formation on the surface of the solid and its influence on the kinetics of corrosion [2, 10-13].The aim of this work is to develop, using the Fe-Pb-O system as an example, a physicomathematical model for adequate analysis of physicochemical processes in the zone of contact of the solid metal with the liquid one in a wide range of concentrations of the admixture in the medium. From the analytical point of view, the description of the phenomena is based on reactive diffusion and involves adsorption, chemical transformations, and diffusion of all components of the system. Physicochemical Aspects of the Interaction of Iron with a Lead MeltIf the medium (Pb) does not contain oxygen, then we have the dissolution of iron in lead [13,14]. In the opposite case, the atoms of oxygen are adsorbed on the surface of iron. Their surface concentration increases up to a value which corresponds to conditions of equilibrium with the medium. When it is insufficient for the formation of stable chemical compounds, then oxygen can dissolve in iron according to the law of diffusion. Simultaneously, iron dissolves in lead. But we have a more interesting case (from both the ...

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First principles calculations of behavior of lithium and interaction with helium in molybdenum

Zhang

Guo

et al. 2019

Fusion Engineering and Design

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Effect of liquid lithium on the structure and strength of refractory metals

Cited by 4 publications

References 7 publications

Erosion of lithium coatings on TZM molybdenum and graphite during high-flux plasma bombardment

Erosion of lithium coatings on TZM molybdenum and graphite during high-flux plasma bombardment

A physicomathematical model of corrosion of iron in a lead melt with an admixture of oxygen

First principles calculations of behavior of lithium and interaction with helium in molybdenum

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