THE INFLUENCE OF MECHANICAL ACTIVATION ON THE STRUCTURAL-PHASE STATES AND HYDROGEN ABSORPTION PROPERTIES OF THE INTERMETALLIC COMPOUND LANI₅ – REVIEW

The article provides an overview of a number of studies on the use of alloys and intermetallic compounds for hydrogen storage. Among them, a particularly important place is occupied by the inter-metallic compound LaNi₅ eye. The latest achievements in the development of intermetallic compounds of the AB₅-type are analyzed. These compounds, in particular LaNi₅ and its alloyed counterparts, are widely used due to the ability to regulate their properties by replacing elements. The article also provides an overview of the methods of synthesis and modification of AB5 alloys aimed at improving their efficiency in hydrogen technologies. Both traditional production methods and modern technological approaches, including Spark plasma sintering and mechanical activation, are considered. A review of the scientific literature has shown that mechanical activation is an effective way to modify the LaNi₅ intermetallic compound to improve its hydrogen absorption properties. According to a number of studies, the effect of high-energy ball milling leads to significant changes in the microstructure of the material. It is shown that to increase the effectiveness of practical applications of LaNi5 in hydrogen energy, additional comprehensive studies are needed to establish the relationship between mechanical processing parameters, structural characteristics, and functional properties of the material.The aim of this work is to use mechanical activation to modify the microstructure of a material, reduce the size of crystallites, increase the density of defects, and promote the formation of amorphous or nanostructured states, which together can significantly affect the structure and interactions with hydrogen.