纳米晶材料
材料科学
矫顽力
晶粒生长
晶界
活化能
居里温度
合金
等温过程
粒度
晶界扩散系数
热力学
放热反应
热稳定性
冶金
凝聚态物理
化学工程
纳米技术
物理化学
铁磁性
化学
微观结构
物理
工程类
作者
Wei Ren,Xi Lan,Zhen Guo
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2023-12-01
卷期号:170 (12): 123504-123504
标识
DOI:10.1149/1945-7111/ad116a
摘要
Electrodeposited nanocrystalline soft magnetic materials have emerged as one of the hottest research topics in the field of magnetic materials due to they are easy to implement in miniaturization, lightweight, and energy-saving of electronic devices. The thermal stability and grain growth process of electrodeposited Fe-55wt%Ni alloy were investigated. Results indicated that the grain growth was rapid at a temperature of about 678 K, while the exothermic peak appeared in DSC with an exothermic heat of about 12 ± 1 J g −1 . The activation energy for grain growth was obtained through the optimized Kissinger equation and isothermal kinetics calculations, and the growth mechanism was evaluated based on the calculation results. Below 678 K, the activation energy required for grain growth was low, which implied the growth mechanism was the rearrangement of atoms at the grain boundary; Above 678 K, the growth mechanism was grain boundary diffusion. After the low-temperature heat treatment, the coercivity ( H c ) decreased and the saturation magnetization ( M s ) increased slightly, which was attributed to the reduction of internal stress and the ultra-fine nanocrystalline structure. The optimal heat treatment process was 573 K heat treatment for 5 h, where M s and H c of 160 emu g −1 and below 1 Oe, respectively.
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