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Phase transformation in Co-, Mn-, and Al-doped iron disilicide alloys

Chen, Haiyan and Zhao, Xinbing and Müller, Eckhard and Platzek, Dieter and Stiewe, Christian and Muchilo, Dmitry (2005) Phase transformation in Co-, Mn-, and Al-doped iron disilicide alloys. In: Proc. 24th Int. Conf. on Thermoelectrics (ICT 2005), pp. 365-368. Institute of Electrical and Electronics Engineers, Inc.. ICT 2005 - 24th Int. Conf. on Thermoelectrics, 2005-06-19 - 2005-06-23, Clemson, SC (USA). ISBN 0-7803-9552-1 ISSN 1094-2734

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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/21381/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Phase transformation in Co-, Mn-, and Al-doped iron disilicide alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Chen, HaiyanUNSPECIFIEDUNSPECIFIED
Zhao, XinbingZhejiang University, Hangzhou, PR ChinaUNSPECIFIED
Müller, EckhardUNSPECIFIEDUNSPECIFIED
Platzek, DieterUNSPECIFIEDUNSPECIFIED
Stiewe, ChristianUNSPECIFIEDUNSPECIFIED
Muchilo, DmitryUNSPECIFIEDUNSPECIFIED
Date:November 2005
Journal or Publication Title:Proc. 24th Int. Conf. on Thermoelectrics (ICT 2005)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 365-368
Editors:
EditorsEmail
Tritt, Terry M.UNSPECIFIED
Publisher:Institute of Electrical and Electronics Engineers, Inc.
ISSN:1094-2734
ISBN:0-7803-9552-1
Status:Published
Keywords:thermoelectric materials, iron disilicide, phase transition, high pressure
Event Title:ICT 2005 - 24th Int. Conf. on Thermoelectrics
Event Location:Clemson, SC (USA)
Event Type:international Conference
Event Dates:2005-06-19 - 2005-06-23
Organizer:Clemson University, Dept. of Physics and Astronomy
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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