材料科学
纳米晶材料
居里温度
晶界
合金
热稳定性
磁铁
相(物质)
消磁场
粒度
冶金
分析化学(期刊)
磁化
微观结构
化学工程
纳米技术
铁磁性
凝聚态物理
磁场
有机化学
色谱法
量子力学
物理
化学
工程类
作者
Junwei Zheng,Weiwei Zeng,Caihai Xiao,Yongming Tao,Qingyou Lu,Qinglin Cheng,Cifu Lu,Renheng Tang,Zhaoguo Qiu,Xuefeng Liao,Qing Zhou
标识
DOI:10.1016/j.jmmm.2024.172316
摘要
Thermal demagnetization of Nd-Fe-B permanent magnets at elevated temperature presents a noteworthy challenge. Current research endeavors are concentrated on enhancing the thermal stability of Nd-Fe-B magnets. This study investigates the use of the cost-effective element Gd as a substitute for Nd in nanocrystalline melt-spun [(Nd0.8Pr0.2)1-xGdx]14.3Fe76.9B5.9M2.9 (M = Co, Cu, Al and Ga) (wt.%; x = 0–0.6) alloys. Although Gd substitution is not conducive to the magnetic properties of the alloys at room temperature, the Gd-substituted alloys exhibit excellent high-temperature performance. The Curie temperature (Tc) of the RE2Fe14B phase increases from 582 K to 643 K, with increasing Gd substitution from 0 to 0.6. The α and β coefficients for Gd-free (x = 0) alloy are −0.120 %/K and −0.468 %/K, respectively. By Gd substitution, they respectively increase to −0.068 %/K and −0.295 %/K for x = 0.6 alloy, which are superior to that of reported nanocrystalline Nd-Fe-B alloys and commercially sintered Nd-Fe-B magnets. Microstructural analysis revealed that Gd substitution promotes grain refinement. Furthermore, it was observed that Gd is uniformly distributed across both the grain boundary and main grains. Overall, this study offers a cost-effective and straightforward approach for enhancing the thermal stability of Nd-Fe-B magnets.
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