Phase transitions and hard magnetic properties for rapidly solidified MnAl alloys doped with C,B, and rare earth elements |
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Authors: | Z W Liu C Chen Z G Zheng B H Tan R V Ramanujan |
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Affiliation: | (1) School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China;(2) School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore |
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Abstract: | MnAl alloys are attractive candidates to potentially replace rare earth hard magnets because of their superior mechanical
strength, reasonable magnetic properties, and low cost. In this study, the phase transitions and magnetic properties of melt
spun Mn55Al45 based alloys doped with C, B, and rare earth (RE) elements were investigated. As-spun Mn–Al, Mn–Al–C, and Mn–Al–C–RE ribbons
possessed a hexagonal ε crystal structure. Phase transformations between the ε and the L10 (τ) phase are of interest. The ε → τ transformation occurred at ~500 °C and the reversed τ → ε transformation was observed
at ~800 °C. Moderate carbon addition promoted the formation of the desired hard magnetic L10 τ-phase and improved the hard magnetic properties. The Curie temperature T
C of the τ phase is very sensitive to the C concentration. Dy or Pr doping in MnAlC alloy had no significant effect on T
C. Pr addition can slightly improve the magnetic properties of MnAlC alloy, especially JS. Doping B could not enhance the magnetic properties of MnAl alloy since B is not able to stabilize either the ε phase or
the L10 hard magnetic τ phase. |
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