Design and development of metal-based magnetostrictive composites and their application in high-performance vibration energy harvesting devices

2020年，我继续研究磁致伸缩材料，特别是复合结构的设计和磁致伸缩性能的改善。本研究制备了1-3型和2-2型铁钴复合材料，其中2-2型铁钴复合材料将正磁致伸缩材料和负磁致伸缩材料粘结在一起，显著提高了对外弯曲或偏置磁化引起的磁感应强度变化的敏感性和大小。另一方面，通过在铝基中埋入铁钴纤维制成的轻质高温铁钴复合材料在高温应用中具有潜在的应用前景。此外，对铁钴磁致伸缩复合材料的评价进行了实验和理论研究。用有限元方法分析了2-2和1-3复合材料内部应力和磁感应强度的分布。此外，在理论模型的基础上，得到了机械-磁电转换的理论机理，为设计高效的机械-磁电换能器或传感器，甚至是能量采集器提供了参考。另一部作品正在进行重大修改。另一方面，我也在一个国际会议上做了口头报告。

In 2020, I continued my research in magnetostrictive materials, especially focusing on the design of composite structures and improvement in magnetostrictive properties. A series of iron-cobalt composites were prepared in this study, including 1-3 and 2-2 models.In more detail, a 2-2 model iron-cobalt composite that bonds positive and negative magnetostrictive materials together, significantly improve the sensitivity and magnitude for the magnetic induction variation in response to the exterior bending or bias magnetization.On the other hand, a lightweight high-temperature iron-cobalt composite through embedding the iron-cobalt fiber into an aluminum matrix, exhibits a potential application in the high-temperature application.Besides, the evaluation of iron-cobalt magnetostrictive composite was examined both experimentally and theoretically. The finite element analysis was employed to analyze the distributions of the interior stress and magnetic induction, within both 2-2 and 1-3 composites. Moreover, on the basis of the theoretical model, a theoretical mechanism of mechano-magneto-electric conversion is obtained.This research provides insights into the design of efficient mechano-magneto-electric transductors or sensors, even energy harvesters.In 2020, my study has been published by an international journal (PPS-RRL). And another work is in major revision. On the other hand, I also give an oral presentation at an international conference.