文章信息/Info

Title:

Magnetic Annealing of Giant Magnetostrictive Materials

作者:

馬天宇; 張昌盛; 潘杏雯; 嚴密

(浙江大學材料科學與工程學系 唐仲英傳感材料及應用研究中心 硅材料國家重點實驗室，浙江 杭州 310027)

Author(s):

MA Tianyu;  ZHANG Changsheng;  PAN Xingwen;  YAN Mi

 (State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering,Zhejiang University, Hangzhou 310027, China)

關鍵詞:

磁致伸縮; TbDyFe; 磁場熱處理; 感生各向異性

DOI:

10.7502/j.issn.1674-3962.2012.07.04

文獻標志碼:

A

摘要:

超磁致伸縮材料是一種先進的能量轉換材料，在高新技術和國防軍工領域具有重要的應用價值。在概述TbDyFe超磁致伸縮材料的特點及發展現狀基礎上，重點介紹了<110>取向材料的磁場熱處理研究。在實驗方面，采用區熔定向凝固技術制備了<110>取向TbDyFe多晶材料，在略高于居里點溫度退火時施加磁場，不改變晶體學擇優取向和凝固組織，但能調控初始磁疇分布狀態，改變服役時的磁矩運動過程，從而改善材料磁致伸縮和力學性能。在模擬研究方面，建立了基于能量最低原理的磁疇旋轉模型，模擬了磁熱感生各向異性誘導的初始磁矩再取向過程，得到了形成單軸各向異性的臨界值；模擬了感生各向異性強弱對磁致伸縮“Jump”效應的影響規律，探討了磁場熱處理對<110>取向晶體磁致伸縮的作用機理。 ��

Abstract:

Giant magnetostrictive material (GMM) is a kind of advanced energy transfer material, which is of importance for applications in high�瞭echnical devices. We firstly present in this work the characteristics and developments of TbDyFe GMMs. A review is then given on our recent activities in magnetically annealed TbDyFe GMMs with <110> crystal orientation. Both experimental and theoretical studies demonstrate that magnetic annealing is capable of tuning the initial magnetic moment orientation and hence improving the magnetomechanical performance through changing the moment movement processes. Evidences including magnetic force microscopy (MFM) images, magnetostriction, magnetic induction, stress�瞫train curves and domain rotation simulation are provided.