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Chen, Haiyan and Zhao, Xinbing and Jiang, J. Z. and Lathe, C. and Franz, H. and Karpinski, Gabriele and Müller, Eckhard (2005) Phase transformation of Co-, Mn-, and non-doped iron disilicide alloys under pressure. In: Proc. 3rd European Conf. Thermoelectrics, Ecole des Mines Nancy, FR, 2005, pp. 138-141. ECT 2005 - 3rd European Conf. Thermoelectrics, 2005-09-01 - 2005-09-02, Nancy (FR).
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Abstract
The dynamic behaviour of phase transformation in β-FeSi<sub>2</sub> based thermoelectric materials Fe<sub>1-x</sub>M<sub>x</sub>Si<sub>2+y</sub> (M = Mn or Co) has been studied by using differential scanning calometry (DSC) and in situ high-temperature and high-pressure X-ray powder diffraction measurements (EDXRD) using synchrotron radiation. The investigated materials were powders prepared by rapid solidification (melt spinning). It’s found by DSC and EDXRD that the α+ε eutectic structures in the rapidly solidified alloys transform to β phase (α-Fe<sub>2</sub>Si<sub>5</sub> + ε-FeSi → β-FeSi<sub>2</sub>) in a lower temperature range below 700˚C. The formed β phase decomposes reversely to α and ε phase in a higher temperature range above 950˚C. The observed β formation temperature T<sub>1</sub> is greatly influenced by the heating rate. By EDXRD measurements, it is found that high pressures have a great influence on the phase transformation temperatures T<sub>1</sub> and T<sub>2</sub> (decomposition of β phase). Different doping elements (Mn, Co, or Al) have also great influence on the phase transformation temperature. EDXRD has simulated the process of hot uniaxial pressing.
| Item URL in elib: | https://elib.dlr.de/21356/ | ||||||||||||||||||||||||
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| Document Type: | Conference or Workshop Item (Paper, Poster) | ||||||||||||||||||||||||
| Title: | Phase transformation of Co-, Mn-, and non-doped iron disilicide alloys under pressure | ||||||||||||||||||||||||
| Authors: |
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| Date: | 2 September 2005 | ||||||||||||||||||||||||
| Journal or Publication Title: | Proc. 3rd European Conf. Thermoelectrics, Ecole des Mines Nancy, FR, 2005 | ||||||||||||||||||||||||
| Refereed publication: | No | ||||||||||||||||||||||||
| Open Access: | No | ||||||||||||||||||||||||
| Gold Open Access: | No | ||||||||||||||||||||||||
| In SCOPUS: | No | ||||||||||||||||||||||||
| In ISI Web of Science: | No | ||||||||||||||||||||||||
| Page Range: | pp. 138-141 | ||||||||||||||||||||||||
| Editors: |
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| Status: | Published | ||||||||||||||||||||||||
| Keywords: | thermoelectric materials, iron disilicide, phase transition, high pressure | ||||||||||||||||||||||||
| Event Title: | ECT 2005 - 3rd European Conf. Thermoelectrics | ||||||||||||||||||||||||
| Event Location: | Nancy (FR) | ||||||||||||||||||||||||
| Event Type: | international Conference | ||||||||||||||||||||||||
| Event Dates: | 2005-09-01 - 2005-09-02 | ||||||||||||||||||||||||
| Organizer: | INPL, Ecole des Mines Nancy, FR | ||||||||||||||||||||||||
| HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||||||||||||||
| HGF - Program: | Aeronautics | ||||||||||||||||||||||||
| HGF - Program Themes: | Propulsion Systems (old) | ||||||||||||||||||||||||
| DLR - Research area: | Aeronautics | ||||||||||||||||||||||||
| DLR - Program: | L ER - Engine Research | ||||||||||||||||||||||||
| DLR - Research theme (Project): | L - Virtual Engine and Validation Methods (old) | ||||||||||||||||||||||||
| Location: | Köln-Porz | ||||||||||||||||||||||||
| Institutes and Institutions: | Institute of Materials Research > Structural and Functional Ceramics | ||||||||||||||||||||||||
| Deposited By: | Müller, Dr.phys. Wolf Eckhard | ||||||||||||||||||||||||
| Deposited On: | 23 Jan 2006 | ||||||||||||||||||||||||
| Last Modified: | 27 Apr 2009 04:54 |
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