Contractual Responsibility of Marketplaces

The rapid development of e-commerce generates new subjects of civil turnover. Marketplaces are commodity aggregators with a vague legal status. A marketplace is more than an information intermediary: it is an ecosystem with highly developed logistics that provides interaction between the seller and the buyer, as well as information about goods and delivery points. In addition, it settles disputes between sellers and buyers by applying various resolution tools. The article describes the legal nature of the relations connected with marketplace ecosystems, i.e., between the marketplace and the seller, between the marketplace and the delivery point, between the marketplace and the buyer. The author also assessed the integration of the marketplace into the classic purchase-and-sale relationship between the buyer and the seller. These parties sign commission contracts, agency agreements, and fee-based service contacts, each of which has its specifics. The author defined the limits of contractual liability in the seller – marketplace – consumer trade chain. If the seller – buyer relations are violated, the responsibility of the marketplace needs to be expanded because the marketplace undertakes to verify the reliability of sellers and the quality of goods. The author applied a doctrinal perspective to the legislative initiatives of 2023–2024 in relation to marketplaces, as well as developed some recommendations on how to improve e-commerce legislation in the Russian Federation

Surface Morphology and Formation of Nanocrystals in an Amorphous Zr₅₅Cu₃₀Al₁₀Ni₅ Alloy under High-Pressure Torsion

A change in the structure of an amorphous Zr55Cu30Al10Ni5 alloy under deformation by high-pressure torsion (HPT) was studied by X-ray diffraction, high-resolution electron microscopy, scanning electron microscopy, and atomic force microscopy. It was found that the uneven distribution of deformation along the radius of the sample, characteristic of deformation by high-pressure torsion, led to the formation of an inhomogeneous structure. The formation of nanocrystals begins at the periphery of the sample. The threshold value of deformation required for crystallization onset was established; the formation of nanocrystals begins in areas with true deformation e = 4.83 or more. An increase in the deformation degree led to an increase in the height of steps on the deformed sample surface and an increase in the roughness of the surface. The thickness of an elementary step that was formed when one shear band came out to the surface was 10 nm, and its height was about 1 nm. It was found that large steps on the deformed surface of the sample had a complex structure and consisted of a large number of elementary steps. The results obtained are important for analyzing the stress distribution and the concentration of free volume in a deformed material, which affect the parameters of the amorphous-nanocrystalline structure formed