Phase Transitions in Mechanically Milled Mn-Al-C Permanent Magnets
AbstractMn-Al powders were prepared by rapid solidification followed by high-energy mechanical milling. The rapid solidification resulted in single-phase ε. The milling was performed in both the ε phase and the τ phase, with the τ-phase formation accomplished through a heat treatment at 500 °C for 10 min. For the ε-milled samples, the conversion of the ε to the τ phase was accomplished after milling via the same heat treatment. Mechanical milling induced a significant increase in coercivity in both cases, reaching 4.5 kOe and 4.1 kOe, respectively, followed by a decrease upon further milling. The increase in coercivity was the result of grain refinement induced by the high-energy mechanical milling. Additionally, in both cases a loss in magnetization was observed. Milling in the ε phase showed a smaller decrease in the magnetization due to a higher content of the τ phase. The loss in magnetization was attributed to a stress-induced transition to the equilibrium phases, as no site disorder or oxidation was observed. Surfactant-assisted milling in oleic acid also improved coercivity, but in this case values reached >4 kOe and remained stable at least through 32 h of milling.
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Lucis, M.J.; Prost, T.E.; Jiang, X.; Wang, M.; Shield, J.E. Phase Transitions in Mechanically Milled Mn-Al-C Permanent Magnets. Metals 2014, 4, 130-140.
Lucis MJ, Prost TE, Jiang X, Wang M, Shield JE. Phase Transitions in Mechanically Milled Mn-Al-C Permanent Magnets. Metals. 2014; 4(2):130-140.Chicago/Turabian Style
Lucis, Michael J.; Prost, Timothy E.; Jiang, Xiujuan; Wang, Meiyu; Shield, Jeffrey E. 2014. "Phase Transitions in Mechanically Milled Mn-Al-C Permanent Magnets." Metals 4, no. 2: 130-140.