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Properties of Co-doped N-type FeSi 2 processed by mechanical alloying

Properties of Co-doped N-type FeSi 2 processed by mechanical alloying Abstract Iron-silicide was produced with a mechanical alloying process and consolidated through vacuum hot pressing. The as-milled powders were of metastable state and fully transformed into the ß-FeSi2 phase through subsequent isothermal annealing. The as-consolidated iron silicides consisted of an untransformed mixture of α-Fe2Si5 and ɛ-FeSi phases and a partially transformed β-FeSi2 phase was found in the low density compact. Isothermal annealing was carried out to induce transformation into a thermoelectric semiconducting β-FeSi2 phase. The transformation behavior of the β-FeSi2 was investigated utilizing DTA, SEM, and XRD analyses. Isothermal annealing at 830°C in vacuum led to a thermoelectric semiconducting β-FeSi2 phase transformation, but some residual metallic α and ɛ-phases were unavoidable even after 96 hours of annealing. The iron silicide microstructures were investigated using SEM and TEM. The mechanical and thermoelectric properties of the β-FeSi2 materials before and after isothermal annealing are characterized in this study. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png "Metals and Materials International" Springer Journals

Properties of Co-doped N-type FeSi 2 processed by mechanical alloying

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References (12)

Publisher
Springer Journals
Copyright
2002 Springer
ISSN
1598-9623
DOI
10.1007/BF03027014
Publisher site
See Article on Publisher Site

Abstract

Abstract Iron-silicide was produced with a mechanical alloying process and consolidated through vacuum hot pressing. The as-milled powders were of metastable state and fully transformed into the ß-FeSi2 phase through subsequent isothermal annealing. The as-consolidated iron silicides consisted of an untransformed mixture of α-Fe2Si5 and ɛ-FeSi phases and a partially transformed β-FeSi2 phase was found in the low density compact. Isothermal annealing was carried out to induce transformation into a thermoelectric semiconducting β-FeSi2 phase. The transformation behavior of the β-FeSi2 was investigated utilizing DTA, SEM, and XRD analyses. Isothermal annealing at 830°C in vacuum led to a thermoelectric semiconducting β-FeSi2 phase transformation, but some residual metallic α and ɛ-phases were unavoidable even after 96 hours of annealing. The iron silicide microstructures were investigated using SEM and TEM. The mechanical and thermoelectric properties of the β-FeSi2 materials before and after isothermal annealing are characterized in this study.

Journal

"Metals and Materials International" – Springer Journals

Published: Apr 1, 2002

Keywords: Metallic Materials; Manufacturing, Machines, Tools, Processes; Magnetism, Magnetic Materials; Engineering Thermodynamics, Heat and Mass Transfer; Characterization and Evaluation of Materials; Solid Mechanics

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