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<p>Fe-5 wt% Al soft magnetic composites (SMCs) were prepared through powder blending, compaction, sintering, and annealing. The uniaxial compaction pressures of 200, 250, and 300 kN were used to form green compacts with the relative densities of 82, 85, and 89%, respectively. The green compacts were pre and post-sintered at 600&#xa0;°C and 1200&#xa0;°C. Then the post-sintered compacts were annealed at 800&#xa0;°C for 1 and 2&#xa0;h. The effect of annealing time on the microstructure and soft magnetic properties was investigated using XRD, FE-SEM, and VSM. Annealing Fe-5 wt%Al SMC increased the saturation magnetization by relieving internal stress. Adding 5 wt% Al enhanced the recrystallization in compacts by reducing the crystalline size. The stress relief and crystal rearrangement in the compacts were enhanced by increasing the annealing time from 1 to 2&#xa0;h. Through annealing, a high saturation magnetization (Ms) was recorded in the range of 194.05 to 212.67 emu/g. Also, the low remanence magnetization (Mr) was recorded in the range of 0.41 to 1.49 emu/g due to stress relief in the compacts. The diffusion of porous oxygen and Al in the compacts increased the coercivity(Hc) from 22.88 to 32.17 Oe. Eventually, the decrease in crystalline size reduced the hardness of the compacts. Cold sintering process reducess the Ms of the compacts deveoped after sintering due to the high internal stress in the compacts after compaction. But the annealing after sintering enhanced the Ms of the compacts. When compared to the high Ms of other processing technique the Ms recorded by this work have increased in the range of 4.63–13.01%.</p>

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Effect of Annealing Time and Compaction Pressure on the Microstructure and Magnetic Properties of Fe-5wt%Al Soft Magnetic Composite

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Rajeeth Kumar R.,
  • Jeevanantham A. K.

摘要

Fe-5 wt% Al soft magnetic composites (SMCs) were prepared through powder blending, compaction, sintering, and annealing. The uniaxial compaction pressures of 200, 250, and 300 kN were used to form green compacts with the relative densities of 82, 85, and 89%, respectively. The green compacts were pre and post-sintered at 600 °C and 1200 °C. Then the post-sintered compacts were annealed at 800 °C for 1 and 2 h. The effect of annealing time on the microstructure and soft magnetic properties was investigated using XRD, FE-SEM, and VSM. Annealing Fe-5 wt%Al SMC increased the saturation magnetization by relieving internal stress. Adding 5 wt% Al enhanced the recrystallization in compacts by reducing the crystalline size. The stress relief and crystal rearrangement in the compacts were enhanced by increasing the annealing time from 1 to 2 h. Through annealing, a high saturation magnetization (Ms) was recorded in the range of 194.05 to 212.67 emu/g. Also, the low remanence magnetization (Mr) was recorded in the range of 0.41 to 1.49 emu/g due to stress relief in the compacts. The diffusion of porous oxygen and Al in the compacts increased the coercivity(Hc) from 22.88 to 32.17 Oe. Eventually, the decrease in crystalline size reduced the hardness of the compacts. Cold sintering process reducess the Ms of the compacts deveoped after sintering due to the high internal stress in the compacts after compaction. But the annealing after sintering enhanced the Ms of the compacts. When compared to the high Ms of other processing technique the Ms recorded by this work have increased in the range of 4.63–13.01%.