Transactions of Nonferrous Metals Society of China >
Magnetic hardening strategy for high-performance Sm(CoFeCuZr)z sintered permanent magnets prepared by dual-alloy process
a Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
b School of Mechanical and Aerospace Manufacturing Engineering, Anyang Institute of Technology, Anyang 455000, China;
c State Key Laboratory of Materials Low-Carbon Recycling, Beijing University of Technology, Beijing 100124, ChinaOnline published: 2026-04-22
To improve the overall magnetic properties of Sm(CoFeCuZr)z sintered magnets, a dual-alloy sintering process that involves mixing high-iron, low-copper powders with low-iron, high-copper powders was systematically investigated. The results demonstrate that this method significantly improves the Cu-lean phenomenon at the grain boundaries, achieves multiscale uniform microstructures, greatly enhances the pinning field strength, and ultimately produces a high-performance dual-alloy magnet with a maximum energy product ((BH)max) exceeding 240 kJ/m3 and an intrinsic coercivity (Hcj) exceeding 2400 kA/m. In particular, when 35 wt.% of low-iron, high-copper alloy powder is incorporated, the dual-alloy magnet achieves a remanence of 1.13 T, Hcj of 2691.2 kA/m and (BH)max of 248 kJ/m3. To evaluate the overall magnetic performance, the sum of Hcj (in kA/m) and (BH)max (in kJ/m3) is used as a combined parameter, yielding a value of 2939.2. Compared with single-alloy magnets of the same composition, the dual-alloy sintering process yields magnets with a more uniform elemental distribution and superior magnetic properties.
Jian-jun YANG, Dong-tao ZHANG, Yu-qing LI, Zan LONG, Cheng-zhen MENG, Wei-qiang LIU, Ming YUE . Magnetic hardening strategy for high-performance Sm(CoFeCuZr)z sintered permanent magnets prepared by dual-alloy process[J]. Transactions of Nonferrous Metals Society of China, 2026 , 36(3) : 917 -928 . DOI: 10.1016/S1003-6326(25)67006-3
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