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Open AccessArticle

Structure and Properties of Fe–Al–Si Alloy Prepared by Mechanical Alloying

Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Technická 5, Prague 6, 166 28 Prague, Czech Republic
Institute of Physics of the ASCR, v. v. i., Na Slovance 2, Prague 8, 182 21 Prague, Czech Republic
Department of Materials, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, Prague 2, 120 00 Prague, Czech Republic
Czech Geological Survey, Geologická 6, Prague 5, 152 00 Prague, Czech Republic
Author to whom correspondence should be addressed.
Materials 2019, 12(15), 2463;
Received: 3 July 2019 / Revised: 26 July 2019 / Accepted: 31 July 2019 / Published: 2 August 2019
(This article belongs to the Special Issue Advanced Powder Metallurgy Technologies)
Fe–Al–Si alloys have been previously reported as an interesting alternative to common high-temperature materials. This work aimed to improve the properties of FeAl20Si20 alloy (in wt.%) by the application of powder metallurgy process consisting of ultrahigh-energy mechanical alloying and spark plasma sintering. The material consisted of Fe3Si, FeSi, and Fe3Al2Si3 phases. It was found that the alloy exhibits an anomalous behaviour of yield strength and ultimate compressive strength around 500 °C, reaching approximately 1100 and 1500 MPa, respectively. The results also demonstrated exceptional wear resistance, oxidation resistance, and corrosion resistance in water-based electrolytes. The tested manufacturing process enabled the fracture toughness to be increased ca. 10 times compared to the cast alloy of the same composition. Due to its unique properties, the material could be applicable in the automotive industry for the manufacture of exhaust valves, for wear parts, and probably as a material for selected aggressive chemical environments. View Full-Text
Keywords: iron silicide; Fe–Al–Si alloy; mechanical alloying; spark plasma sintering; characterization iron silicide; Fe–Al–Si alloy; mechanical alloying; spark plasma sintering; characterization
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Novák, P.; Vanka, T.; Nová, K.; Stoulil, J.; Průša, F.; Kopeček, J.; Haušild, P.; Laufek, F. Structure and Properties of Fe–Al–Si Alloy Prepared by Mechanical Alloying. Materials 2019, 12, 2463.

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