Anisotropic Texture Development of High Energy NdFeB Permanent Magnets for Electric Vehicles and Automated Highway Systems

在电动汽车电机或其他移动平台中使用先进的Nd2Fe14B(Nd2Fe14B)永磁系统的前景，主要是由于i)降低输入功率要求的需要，以及ii)减小驱动系统的尺寸和重量。永磁体性能的决定性参数是其残余量(BR)和最大储能积(BH)max，后者提供了可提取的功的量的度量。原则上，(BH)max越大，现有设备减小尺寸和重量的潜力就越大。在Nd2Fe14B永磁体中，通过热机械加工过程中微晶的各向异性织构排列，可以使BR和(BH)max提高300-400%。这项拟议的项目试图规定并实验验证基于微观力学的变形处理方法(锻造、轧制或挤压)，以在Nd2Fe14B基永磁体中纳入有利的c轴织构排列。这些方法将用于各种必需的最终横截面或形状(方形、圆形、磁带或环形磁铁)，最终提高残余量(BR)和存储能量积(BH)max的性能。

The prospect of using advanced Neodymium-Iron-Boron (Nd2Fe14B) permanent magnet systems in electric vehicle motors, or other mobile platforms, is principally driven by i) the need to reduce input power requirements, as well as ii) to reduce the size and weight of drive systems. The decisive parameters for permanent magnet performance are its remnance (Br) and the maximum stored energy product (BH)max which provides a measure of the amount of work that can be extracted. In principle the larger the (BH)max, the greater the potential for reducing the size and weight of an existing device. In Nd2Fe14B permanent magnets, both Br and (BH)max can be improved 300-400% via anisotropic textural alignments of the crystallites during thermo-mechanical processing. This proposed project attempts to prescribe, and experimentally validate, micro-mechanics based deformation processing methodologies (forging, rolling or extrusion), to incorporate favorable 'c' axis textural alignments in Nd2Fe14B-based permanent magnets. These methodologies will be demonstrated for a variety of requisite final cross-section or shape (square, round, tape or ring magnets), with an eventual performance increase in both remnance (Br) and stored energy product (BH) max.