A CALPHAD assessment of the Al–Mn–C system supported by ab initio calculations

Tang, Florian; Bogdanovski, Dimitri; Bajenova, I.; Khvan, A.; Dronskowski, Richard; Hallstedt, Bengt

doi:10.1016/j.calphad.2018.01.006

Cited by 12 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This discrepancy suggests that substantial magnetization is originated from another phase. The likely source is the κ phase, which exhibits ferromagnetism near room temperature [27,28]. This is also consistent with the finding of the largest magnetization in MnAl-C3, with the highest κ phase composition.…”

Section: Mnal-c Powders After Annealingsupporting

confidence: 88%

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

et al. 2021

View full text Add to dashboard Cite

Process parameters leading to magnetic polymer composites, an essential ingredient in the additive manufacturing of rare-earth-free magnets, are investigated. The induction melting of manganese (Mn) and aluminum (Al), and subsequent annealing at 450, 500, or 550 °C for 20 min, gave rise to ferromagnetic τ–MnAl phase, as well as other phases. The nonmagnetic Al4C3 and oxide phases were then removed by the magnetic separation. Magnetic powders from the magnetic separation were incorporated in polylactic acid (PLA) matrix via a solution route. The remanent magnetization as high as 4.3 emu/g in the powder form was reduced to 2.3–2.6 emu/g in the composites. The reduction in coercivity was minimal, and the largest value of 814 Oe was obtained when the powder annealed at 450 °C was loaded in the composite. The phase composition and hence magnetic properties were even more sensitive to the carbon (C) doping. Interestingly, the addition of 3% C led to coercivity as high as 1445 Oe in MnAl–C powders without further annealing. The enhanced coercivity was attributed to the domain wall pinning by the AlMn3C phase, and magnetizations are likely increased by this phase.

show abstract

Section: Mnal-c Powders After Annealingsupporting

confidence: 88%

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In general, it was well-accepted that −COOH groups on the carbon fiber and graphene oxide can aid in the extraction of heavy metals from water, because the −COOH group on the carbon support captures metal cations such as Fe 2+ , Cu 2+ , Fe 3+ , Cd 2+ , and Pb 2+ and form −COOM, (M = metal) . According to this anion adsorption mechanism, MnO v is considered to be coordinated with CNTs through the COO–Mn linkage. ,,, However, from the viewpoint of metallurgy, manganese also has a chemical affinity to carbon, and thus it is known to form phases of manganese carbides such as, MnC, Mn 3 C, Mn 5 C 2 , Mn 7 C 3 , and Mn 23 C 6 . This suggests that other than COO–Mn linkage, there are other possibilities for linkages between the metal oxide and graphite-based materials (G based ).…”

Section: Introductionmentioning

confidence: 99%

Effect of Composition Ratios on the Performance of Graphene/Carbon Nanotube/Manganese Oxide Composites toward Supercapacitor Applications

Saravanan

Wang

et al. 2019

ACS Omega

View full text Add to dashboard Cite

Herein, we describe the preparation and characterization of graphene/carbon nanotube (CNT)/MnO v composites and the effects of chemical composition and phase transformation on the properties of the corresponding electrode film. In general, the effect of graphene-to-CNT ratio (G/C ratio) and the manganese (Mn) content on the morphology, chemical state, crystallization properties, and microstructure of the composite material was examined by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and selected area electron diffraction. The bonding mechanism between MnO v and graphite-based materials, that is, graphene and CNTs, is discussed. The influence of the composition of the composites on the performance of the electrode was investigated using charge–discharge curves. The faradically active MnO v also functioned as a considerable cobinder and allowed for a reduced amount of polymeric binder, which enhanced the conductivity and capacitance of the electrode. The optimized electrode composition was obtained based on our present graphene and CNT specifications. In summary, the results discussed in this article provide significant background information for future applications of graphene/CNT/MnO v composite electrodes.

show abstract

“…In the AlMnC phase diagram, the area of the ¾-phase expanded for x = 24 at maximum for both Mnrich and Al-rich regions. 27,28) Therefore, it is suggested that the carbon-addition-induced stabilization of the ¾-phase is x ³ 4 at maximum at 1073 K, resulting in the enhancement of the ¾¸transformation. For x > 4, because of the instability of the ¾-phase, the fraction of the¸-phase reduced.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Ferromagnetic τ-Mn–Al–C by Reactive Sintering

et al. 2021

View full text Add to dashboard Cite

Ferromagnetic MnAlC (¸-phase) can be synthesized by a single-route conventional reactive sintering method. The maximum magnetization and coercivity were 75.8 Am 2 /kg and 57 mT, respectively. The¸-phase fraction was evaluated to be 81 mass% for Mn 55 Al 45 C 2 annealed at 1273 K. The¸-phase of Mn 55 Al 45 C 2 can be synthesized at an annealing temperature from 873 to 1273 K, whereas that of Mn 55 Al 45 cannot be synthesized. It was indicated that the phase stability of the hcp-phase (¾-phase) was improved by adding carbon, resulting in an ¾ţ ransformation.

show abstract

A CALPHAD assessment of the Al–Mn–C system supported by ab initio calculations

Cited by 12 publications

References 40 publications

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

Effect of Composition Ratios on the Performance of Graphene/Carbon Nanotube/Manganese Oxide Composites toward Supercapacitor Applications

Synthesis of Ferromagnetic τ-Mn–Al–C by Reactive Sintering

Contact Info

Product

Resources

About