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Open AccessArticle

Effect of Initial Powders on Properties of FeAlSi Intermetallics

1
Department of Materials, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, 12000 Prague, Czech Republic
2
Department of Metals and Corrosion Engineering, University of Chemistry and Technology, 16628 Prague, Czech Republic
3
Institute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2019, 12(18), 2846; https://doi.org/10.3390/ma12182846
Received: 16 August 2019 / Revised: 29 August 2019 / Accepted: 31 August 2019 / Published: 4 September 2019
(This article belongs to the Special Issue Advanced Powder Metallurgy Technologies)
FeAlSi intermetallics are materials with promising high-temperature mechanical properties and oxidation resistance. Nevertheless, their production by standard metallurgical processes is complicated. In this study, preparation of powders by mechanical alloying and properties of the samples compacted by spark plasma sintering was studied. Various initial feedstock materials were mixed to prepare the material with the same chemical composition. Time of mechanical alloying leading to complete homogenization of powders was estimated based on the microstructure observations, results of XRD and indentation tests. Microstructure, phase composition, hardness and fracture toughness of sintered samples was studied and compared with the properties of powders before the sintering process. It was found that independently of initial feedstock powder, the resulting phase composition was the same (Fe3Si + FeSi). The combination of hard initial powders required the longest milling time, but it led to the highest values of fracture toughness. View Full-Text
Keywords: FeAlSi; intermetallic alloys; mechanical alloying; spark plasma sintering; microstructure; nanoindentation; mechanical properties FeAlSi; intermetallic alloys; mechanical alloying; spark plasma sintering; microstructure; nanoindentation; mechanical properties
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MDPI and ACS Style

Čech, J.; Haušild, P.; Karlík, M.; Bouček, V.; Nová, K.; Průša, F.; Novák, P.; Kopeček, J. Effect of Initial Powders on Properties of FeAlSi Intermetallics. Materials 2019, 12, 2846.

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