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Phase transformation of Co-, Mn-, and non-doped iron disilicide alloys under pressure

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).

Full text not available from this repository.

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/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:Phase transformation of Co-, Mn-, and non-doped iron disilicide alloys under pressure
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Chen, HaiyanUNSPECIFIEDUNSPECIFIED
Zhao, XinbingZhejiang University, Hangzhou, PR ChinaUNSPECIFIED
Jiang, J. Z.Zhejiang University, Hangzhou, PR ChinaUNSPECIFIED
Lathe, C.DESY, HamburgUNSPECIFIED
Franz, H.DESY, HamburgUNSPECIFIED
Karpinski, GabrieleUNSPECIFIEDUNSPECIFIED
Müller, EckhardUNSPECIFIEDUNSPECIFIED
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:
EditorsEmail
Lenoir, BertrandUNSPECIFIED
Dauscher, AnneUNSPECIFIED
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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