The Sm-Fe-V based 1:12 bulk magnets

Abstract : A bulk magnet based on Sm-Fe-V with the ThMn12 crystal structure has been fabricated for the first time by hot-compaction of mechanically milled powders with a density of 92% of the theoretical density. The isotropic magnet exhibits a maximum coercivity of 1.06 T with a magnetization of 0.59 T, a remanent magnetization of 0.42 T and a (BH)max of 28 kJ m−3 at 3 T applied field. The Curie temperature is found to be 330 °C and the temperature coefficients of remanent magnetization and coercivity are 0.14% C−1 and 0.39% C−1, respectively. Minor hysteresis loops indicate a coercivity mechanism similar to that of the nanocrystalline Nd-Fe-B magnets. The isotropic magnet was hot-deformed up to 75% of its height, and the best magnetic properties obtained were μ0M3T = 0.63 T, μ0Mr = 0.45 T, μ0Hc = 0.88 T and (BH)max = 33 kJ m−3. A small texture perpendicular to compaction direction was detected when the amount of vanadium was reduced, and the deformation temperature was increased from 800 to 1000 °C.
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https://hal.archives-ouvertes.fr/hal-02264183
Contributor : Rajasekhar Madugundo <>
Submitted on : Thursday, August 8, 2019 - 10:57:24 AM
Last modification on : Saturday, August 24, 2019 - 1:09:07 AM

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A.M. Schönhöbel, Rajasekhar Madugundo, A.M. Gabay, J.M. Barandiarán, G.C. Hadjipanayis. The Sm-Fe-V based 1:12 bulk magnets. Journal of Alloys and Compounds, Elsevier, 2019, 791, pp.1122-1127. ⟨https://www.sciencedirect.com/science/article/abs/pii/S0925838819310758⟩. ⟨10.1016/j.jallcom.2019.03.249⟩. ⟨hal-02264183⟩

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