Abstract
It is shown that the main modifiers of foundry magnesium alloys cannot create heterogeneous crystallization centers in melts during their solidification. Modification of alloy structures is an adsorption‑nanostructural process. It is shown that adsorbed hydrogen is a modifying element of the structures of foundry magnesium alloys. The mechanism of their modification consists in a large decrease in the concentration of adsorbed hydrogen in melts by significantly reducing the concentration of dissolved hydrogen.
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