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The Effect of Oxygen Partial Pressure on Microstructure and Properties of Fe40Al Alloy Sintered under Vacuum

Department of Advanced Materials and Technologies, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland
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These authors contributed equally to this work.
Academic Editor: Marco Salerno
Materials 2015, 8(4), 1513-1525; https://doi.org/10.3390/ma8041513
Received: 18 February 2015 / Revised: 18 March 2015 / Accepted: 19 March 2015 / Published: 31 March 2015
(This article belongs to the Special Issue Intermetallic Alloys: Fabrication, Properties and Applications)
This paper presents the results of studies on the influence of oxygen partial pressure (vacuum level in the chamber) on the properties of FeAl intermetallics. One of the problems in the application of classical methods of prepared Fe-Al intermetallic is the occurrence of oxides. Applying a vacuum during sintering should reduce this effect. In order to analyze the effect of oxygen partial pressure on sample properties, five samples were processed (by a pressure-assisted induction sintering—PAIS method) under the following pressures: 3, 8, 30, 80, and 300 mbar (corresponding to oxygen partial pressures of 0.63, 1.68, 6.3, 16.8, and 63 mbar, respectively). The chemical and phase composition, hardness, density, and microstructure observations indicate that applying a vacuum significantly impacts intermetallic samples. The compact sintered at pressure 3 mbar is characterized by the most homogeneous microstructure, the highest density, high hardness, and nearly homogeneous chemical composition. View Full-Text
Keywords: iron aluminides; phase identification; oxides; vacuum; reaction synthesis iron aluminides; phase identification; oxides; vacuum; reaction synthesis
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Siemiaszko, D.; Kowalska, B.; Jóźwik, P.; Kwiatkowska, M. The Effect of Oxygen Partial Pressure on Microstructure and Properties of Fe40Al Alloy Sintered under Vacuum. Materials 2015, 8, 1513-1525.

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