Design, Preparation, and Performance Study of Novel Magnetic Magnesium Alloys

The problems to be solved in the project and the planned goals to be achieved are: 1. Introduction of magnetic centers, key technologies for alloying design and composite material preparation; 2. Interdependence between material microstructure, process parameters, and mechanical and magnetic properties; 3. Corrosion law of composite materials and its improvement methods. The planned goal is 1. A magnetic magnesium alloy with a simple and controllable process that can improve magnetic energy product and strong corrosion resistance, as well as its preparation method. 2. Revealing the influence mechanism and key regulation of the magnetic behavior of the alloy. Magnesium alloy is currently the lightest engineering metal structural material, with advantages such as light specific gravity, high specific strength to stiffness, good damping and machinability, good thermal conductivity, strong electromagnetic shielding ability, and easy recycling. It meets the requirements of aviation, aerospace, and modern automotive industries for weight reduction and energy conservation, and can replace engineering plastics to meet the lightweight, thin, and miniaturization of 3C products, High integration and environmentally friendly magnesium alloy is currently the lightest engineering metal structural material, with advantages such as light specific gravity, high specific strength to stiffness, good damping and machinability, good thermal conductivity, strong electromagnetic shielding ability, and easy recycling. It meets the requirements of aviation, aerospace, and modern automotive industries for weight reduction and energy conservation, and can replace engineering plastics to meet the requirements of lightweight, thin, and miniaturization of 3C products, high integration, and environmental protection, Becoming the preferred choice for the automotive and 3C industries, known as the "green engineering material of the 21st century", it has become one of the fastest growing materials in industrial applications in developed countries and regions. Up to now, research on magnesium alloys at home and abroad is mainly based on lightweight aspects, and there are few reports on the research and utilization of functional structural magnesium alloys, especially the research on magnetic magnesium alloys. The concept of magnetic magnesium alloy has been proposed for a long time, and it has broad application prospects in data storage and sensors. By optimizing the design of magnetic magnesium alloys, it is possible to develop information materials that can be read and written repeatedly. At the same time, magnetostrictive methods can be used to non-destructive measure the real-time load of magnesium alloy structural components or other structural components, thereby determining the safety range of the material. Finally, relevant sensor components can be developed through eddy current theory. However, research on magnetic magnesium alloys is still in its early stages. On the one hand, due to the lack of magnetism in magnesium itself, it is necessary to introduce new magnetic centers through alloying methods. On the other hand, due to the direct addition of magnetic elements such as Fe, Co, Ni, etc., which seriously deteriorate the corrosion performance of magnesium alloys, the development of magnetic magnesium alloys has always been a challenge. Until recently, scientists from Germany and Japan made breakthroughs. For example, the Mg-Sm-Co alloy developed by Professor BachFW at the University of Hanover in Germany introduced Sm-Co permanent magnets into the alloy, exhibiting good magnetism. However, this material was prepared using die-casting method, resulting in uneven dispersion of Sm-Co particles and poor mechanical properties. Additionally, the Sm-Co magnetic energy product was low, resulting in a lower overall magnetic energy product of the prepared magnetic magnesium alloy, Unable to meet sensor requirements. In addition, Professor Masahiro Kubota of the Department of Production and Engineering at the University of Japan used iron oxide based composite materials and magnesium powder to prepare magnetic magnesium alloys through ball milling and plasma sintering. However, due to the large potential difference between the iron phase and the magnesium matrix in the composite material, it is not corrosion-resistant. In addition, the reaction process is intense and the process is complex, difficult to control, and has certain risks. Based on the above background, the proposed project aims to introduce magnetic centers into magnesium alloys through reasonable design and preparation processing, transforming them from traditional structural materials to new smart metals. At the same time, the systematic study of their microstructure and related mechanical and magnetic properties not only has important theoretical guidance significance for the research and development of high-performance magnesium alloys, but also has important theoretical significance, It will also greatly expand the application fields and scope of existing magnesium alloys, meet the inherent needs of industrial upgrading and transformation in Hebei Province, and have good practical value and social benefits.