Phase transitions and hard magnetic properties for rapidly solidified MnAl alloys doped with C, B, and rare earth elements

Liu, Zhongwu; Chen, C.; Zheng, Zhigang; Tan, B.H.; Ramanujan, R.V.

doi:10.1007/s10853-011-6049-8

Cited by 82 publications

(44 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the hard magnetic τ -phase (L1 0 ) of Mn-Al is metastable, the melt-spinning route is suitable to form this ferromagnetic phase [2,3]. This synthesis technique allows to freeze the high temperature paramagnetic ε-phase, which transform into the ferromagnetic τ -phase after annealing at around 550 C. However, formation of τ -phase requires an excess in manganese which can lead to partial antiferromagnetic coupling, i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Addition on Magnetic Order in Mn–Al–C Alloys

et al. 2017

View full text Add to dashboard Cite

Obtaining 100% of metastable τ -phase (L10) in Mn-Al alloys needs addition of carbon and Mn in excess to stabilize the phase. The excess of Mn could lead to partial antiferromagnetic coupling, that would result in a reduction in magnetization, which is in agreement with the experimental results. To clarify this question, (Mn0.55Al0.45)100−xCx alloys, with x between 0 and 2, were rapidly quenched from the melt (by melt-spinning) and annealed at 550 • C. In the as-cast state, the sample is in the hexagonal paramagnetic ε-phase, and after annealing, the sample is in the tetragonal ferromagnetic τ -phase. Different routes for the addition of carbon were used. The structural properties were determined by neutron diffraction, and the magnetic properties by means of VSM measurements and neutron diffraction (ND).

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Addition on Magnetic Order in Mn–Al–C Alloys

et al. 2017

View full text Add to dashboard Cite

show abstract

“…For example, the stability and magnetic properties of MnAl alloys with doping of C, B and rare earth elements have been investigated. Carbon stabilizes the MnAl L1 0 structure but reduces the Curie temperature while B does not stabilize the MnAl structure at all [12]. Zeng et al reported that additions of C into L1 0 -type MnAl increase the saturation magnetization and reduce the anisotropy field [10].…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of Fe-doped MnAl

Manchanda

Kashyap

Shield

et al. 2014

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

“…The equilibrium phases at room temperature that normally result from the decomposition of the ε phase are γ 2 and β-Mn [3]. The ε phase can be stabilized at room temperature by rapid quenching from the ε phase field [4][5][6]. This can be accomplished after conventional solidification and annealing in the ε phase field, or by rapid solidification where the high cooling rate suppresses equilibrium phase formation.…”

Section: Introductionmentioning

confidence: 99%

Phase Transitions in Mechanically Milled Mn-Al-C Permanent Magnets

Lucis

Prost

Jiang

et al. 2014

Metals

View full text Add to dashboard Cite

Mn-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.

show abstract

Phase transitions and hard magnetic properties for rapidly solidified MnAl alloys doped with C, B, and rare earth elements

Cited by 82 publications

References 15 publications

Effect of Carbon Addition on Magnetic Order in Mn–Al–C Alloys

Effect of Carbon Addition on Magnetic Order in Mn–Al–C Alloys

Magnetic properties of Fe-doped MnAl

Phase Transitions in Mechanically Milled Mn-Al-C Permanent Magnets

Contact Info

Product

Resources

About