Presentation Information
[P2-9]The establishment of a microstructural evaluation system in sintered NdFeB magnets via computer vision technology
*Zihao Wang1, Shengen Guan1, Ning Wang1, Zhaohong Feng1, Xiaoqian Bao1, Jiheng Li1, Zhimeng Guo1, Xuexu Gao1 (1. University of Science and Technology Beijing (China))
Keywords:
Sintered NdFeB magnets,Microstructural evaluation system,Image segmentation,Morphological features
The usage of sintered NdFeB magnets has been a dramatic roaring in motors and consumer electronics industries due to their excellent magnetic properties. Over the past few decades, research has primarily focused on composition optimization and microstructure regulation, achieving significant progress. However, the absence of a microstructural evaluation system persists, which not only limits targeted microstructure regulation but also hinders a deeper understanding of the reversal magnetization mechanism. To address this, we utilized image segmentation technology to obtain contour of a single 2:14:1 grain and then quantified morphological features based on domain knowledge. The feature pool was divided into two groups: general features and specialized features. General features are composed of size and shape features, while specialized features defined descriptors including boundary curvature and boundary flatness ratio, which are closely related to non-uniform magnetization and stray fields. This proposed methodology provides a foundation for establishing a microstructure evaluation system, offering theoretical guidance for microstructure regulation and magnetic performance optimization.