Sm-based (Sm, Gd, Y, Zr)-(Fe, Co)-(Mo, V) Alloys with the ThMn12 Structure for Permanent Magnets: Synthesis, Processing and Characterization
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This dissertation investigates the synthesis, processing, and characterization of Sm-based (Sm, Gd, Y, Zr)-(Fe, Co)-(Mo, V) alloys with the ThMn12 structure for permanent magnet development. These materials are important for advancing the performance of rare-earth permanent magnets, which are critical components in various applications ranging from electric motors and generators to data storage devices. Through a comprehensive study of background knowledge and concepts of magnetism, synthesis procedures including the special techniques of melt-spinning and mechanical alloying and advanced structural and microstructural characterization, this research offers new insights into the intrinsic and hard magnetic properties of Sm-Fe(Co) based ThMn12 magnets. The dissertation systematically explores the effects of partial Sm substitution with Gd, Y and Zr and Fe substitution with Mo and V on the intrinsic and hard magnetic properties of these alloys. Additionally, it examines the magnetic hardening mechanisms in as-cast Sm-Fe-V alloys, contributing to the understanding of the coercivity development in bulk magnets. The results of this study demonstrate the potential of these Sm-based magnets to achieve high performance with reduced rare-earth content, addressing both economic and supply concerns associated with critical materials. This work not only contributes to the fundamental understanding of ThMn12 structure magnets, but it also provides a pathway towards the development of new materials for high-temperature and high-performance applications.