Tailoring the magnetic properties and microstructure of Alnico 8 magnets by various Ti contents and processing conditions

被引：18

作者：

Rehman, Sajjad Ur ^{[1
,2
]}

Wei, Chen ^{[3
]}

Zhang, Ruibiao ^{[2
]}

Liu, Haihua ^{[1
]}

Li, Shaoxiong ^{[1
]}

Zhong, Minglong ^{[1
]}

Yang, Munan ^{[1
]}

Jiang, Qingzheng ^{[1
]}

Wang, Jun ^{[3
]}

Zhong, Zhenchen ^{[1
]}

机构：

[1] Jiangxi Univ Sci & Technol, Coll Rare Earths, Jiangxi Key Lab Rare Earth Magnet Mat & Devices, Ganzhou 341000, Peoples R China

[2] Zhejiang Tiantong Elect Informat Mat Res Inst Co L, Hangzhou 314400, Zhejiang, Peoples R China

[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xi'an 710072, Shaanxi, Peoples R China

来源：

INTERMETALLICS | 2022年 / 143卷

关键词：

Magnetic properties; Permanent magnets; Interaction mechanism; Ferromagnetic phase; PERMANENT-MAGNETS; ALLOYS; DECOMPOSITION; COERCIVITY; ANISOTROPY; EVOLUTION; TITANIUM; PHASE;

D O I：

10.1016/j.intermet.2022.107486

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Shape anisotropy, developed as a result of spinodal decomposition (SD) is the basis for the hysteresis behavior of Alnico magnets. The SD process is sensitive to processing conditions and constituent elements. In this paper, the development of spinodal structure and its effects on magnetic properties and serviceability of Alnico 8 alloys are investigated. The Ti-content is varied between 2.5 and 7.5 wt%. The magnets are fabricated by conventional casting, homogenization, magnetic field annealing and tempering treatments. The magnetic properties of intrinsic coercivity, Hcj = 30 kA/m, remanence, Br = 0.53 T and maximum energy density, (BH)max = 6.03 kJ/m3 for 2.5 wt% Ti are increased to Hcj = 150 kA/m, Br = 0.0.88 T and (BH)max = 29.3 kJ/m3 for 6.5 wt% Ti alloy. These magnetic properties are 100% reversible up to 800 K. Furthermore, an alloy with 5.5 wt% Ti is directionally solidified and magnetic properties of Br = 1.01 T and (BH)max = 58.9 kJ/m3 are obtained. The evolution of mosaic nano structure, the mechanism of magnetic hardening and the interactions of various phases have been investigated.

引用

页数：7

共 49 条

[31] Effects of Zr alloying on the microstructure and magnetic properties of Alnico permanent magnets [J].