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Insights into formation and stability of tau-MnAlZ(x) (Z = C and B)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Lund Univ, MAX IV Lab, Box 118, S-22100 Lund, Sweden..
Lund Univ, MAX IV Lab, Box 118, S-22100 Lund, Sweden..
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2017 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 692, p. 198-203Article in journal (Refereed) Published
Abstract [en]

The tau-phase MnAl alloys are promising candidate for rare earth free permanent magnets. In this study, In order to better understand the MnAl epsilon ->tau phase transition mechanism in a continuous cooling process and metastable MnAl tau-phase high temperature stability, Mn0.54Al0.46, Mn0.55Al0.45C0.02 and Mn0.55Al0.45B0.02 alloys were systematically studied by in situ synchrotron X-ray powder diffraction (SR-XRD). The relationship between tau-phase formation tendency and different cooling rates of Mn0.55Al0.45C0.02 was investigated. Besides, the high temperature stabilities of undoped tau-MnAl and carbon/boron doped tau-MnAl were studied. Differential thermal analysis (DTA) was also employed to study the phase transformation as well. The research results show that a high cooling rate of 600 degrees C/min leads to a 50/50 wt% mixture of epsilon- and tau-phase; almost pure tau-phase was obtained when cooled at a moderate cooling rate of 10 degrees C/min; while for a slow cooling rate of 2 degrees C/min, the tau-phase partially decomposed into beta and gamma(2) phases. No intermediate epsilon'-phase was observed during the epsilon ->tau phase transition during the experiments. For the boron and carbon doped tau-MnAl, the 800 degrees C high temperature stability experiments reveal that C stabilizes the tau-MnAl while doped B destabilises the tetragonal structure and it decomposes into beta- and gamma(2)-phases.

Place, publisher, year, edition, pages
2017. Vol. 692, p. 198-203
Keywords [en]
Phase transition, Thermal analysis, In situ, Powder diffraction, Phase stability, Permanent magnet
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:uu:diva-308613DOI: 10.1016/j.jallcom.2016.09.047ISI: 000386231200025OAI: oai:DiVA.org:uu-308613DiVA, id: diva2:1050968
Funder
Swedish Energy AgencySweGRIDS - Swedish Centre for Smart Grids and Energy StorageAvailable from: 2016-11-30 Created: 2016-11-29 Last updated: 2017-11-29Bibliographically approved

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Fang, HailiangCedervall, JohanÅngstrom, JonasBerastegui, PedroSahlberg, Martin

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