Texture Development in Rare Earth-Iron-Boron Magnets

这个节目探讨了导致 热变形过程中晶体织构的发展 快淬钕铁硼磁体。 重点 从两个方面对织构进行了研究：（1） 磁铁，它们与传统烧结磁铁有何不同 与快速凝固相比，以及它们如何依赖于 存在额外的合金元素如铜。 高 分辨率电子显微镜和俄歇能谱用于 探索这些话题。(2)因为纹理的驱动力 形成被认为是弹性能量的差异， 在应力下不同取向的晶粒，需要关于 高于环境温度的弹性常数。 烧结磁体 正确取向的，将被测量，以确定 平行和垂直于c轴的弹性常数 温度的函数，高达700摄氏度。 %%% 织构对磁性金属的性能起着重要的作用 合金. 这项研究提供了重要的信息， 在一个重要的类别中控制纹理的加工因素 磁铁合金

This program explores the basic phenomena that lead to the development of crystallographic texture during hot deformation of rapidly-quenched neodymium-iron-boron magnets. Emphasis is placed on two aspects of the texture: (1) the intergranular phases in the magnets, how they differ in magnets made by conventional sintering compared to rapid solidification, and how they depend on the presence of additional alloying elements such as copper. High resolution electron microscopy and Auger spectroscopy are used to explore these topics. (2) Because the driving force for texture formation is believed to be a difference in elastic energy between grains of different orientation under stress, data is needed on the elastic constants above ambient temperatures. Sintered magnets that are properly oriented are to be measured to determine the elastic constants parallel and perpendicular to the c-axis as a function of temperature, up to 700 degrees Celsius. %%% Texture plays an important role in the properties of magnetic metal alloys. This research provides important information on the processing factors controlling texture in an important class of magnet alloys.