The Relationship Between Structure and Properties in Manganese-Aluminum-Base Permanent Magnet Materials

本研究计划的目的是阐明控制锰/铝（MnAl）永磁材料微观结构和缺陷结构的工艺变量的影响。进一步的目的是了解磁化和磁化反转的机制，这解释了这些铁磁体的磁滞行为和磁性能。一个全面的电子透射显微镜研究计划检查复杂的扩散/位移转变发生在这种材料。在较宽的温度范围内检查压缩载荷下的变形，以确定创建所需纹理的方法。通过测量不同结构状态下的磁滞量来确定其磁性能。这些信息将为设计最佳制造mnal基永磁体的热机械加工方案提供良好的基础。二十多年来，基于锰/铝体系的永磁材料作为一种重要的磁性材料，在各种应用中崭露头角，而不需要更昂贵的稀土永磁的非凡性能。应用受到与加工相关的经济因素的限制。本研究的结果将为基于MnAl （L1）金属间相的永磁体制造带来更多创新和高效的加工策略。＊＊＊

9414302 Soffa An aim of this research program is to clarify the effects of processing variables that control microstructure and defect structure in manganese/aluminum (MnAl) permanent magnet materials. A further aim is to understand the mechanisms of magnetization and magnetization reversal, which account for the hysteresis behavior and magnetic properties of these ferromagnets. A comprehensive electron transmission microscopy study is planned to examine the complex diffusional/displacive transformation occurring in this material. Deformation under compression loading is examined under a broad temperature range to determine ways of creating desired textures. Magnetic hysteresis is measured for different structural states to determine magnetic properties. This information should provide a sound basis for designing thermomechanical processing schemes for optimum manufacturing of MnAl-base permanent magnets. %%% For more than two decades permanent magnet materials based on the manganese/aluminum system have loomed on the horizon as important magnetic materials for a wide variety of applications not requiring the extraordinary properties of the more expensive rare earth permanent magnets. Application has been limited by the economics related to processing. Research results of this investigation should lead to more innovative and efficient processing strategies for manufacturing permanent magnets that are based on the MnAl (L1) intermetallic phase. ***