Evolution of the structure and phase composition of MeVa-MeIVa alloys under the action of liquid lithium
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We present the results of a thorough investigation of the processes occurring on the surface and inside MeVA-MeIVA alloys as a result of their long-term contact with liquid lithium. With V-Ti alloys as an example, we determine the role of nonmetallic impurities (O, N, C) in corrosion processes and suggest a mechanism of the formation of structure and phase composition of the investigated alloys under the action of liquid lithium. In general, the redistribution of interstitials in MeVA-MeIVA alloys leads to the formation of a heterogeneous structure that consists of three zones: (I) a zone where lithium interacts with a base metal, (II) a single-phase zone of a V-Ti-O (C, N) solid solution formed as a result of the dissolution of the oxide phase, and (III) a two-phase zone of internal nitriding with particles of oxynitrides of variable stoichiometry. It is also demonstrated that the directions and rates of diffusive flows of nonmetallic atoms on the melt-metal interface are controllable by rational alloying.
KeywordsOxide Lithium Solid Solution Phase Composition Base Metal
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