Effect of initial powders on properties of FeAlSi intermetallics

0522773 - FZÚ 2020 RIV CH eng J - Journal Article
Čech, J. - Haušild, P. - Karlík, M. - Bouček, V. - Nová, K. - Průša, F. - Novák, P. - Kopeček, Jaromír
Effect of initial powders on properties of FeAlSi intermetallics.
Materials. Roč. 12, č. 18 (2019), s. 1-16, č. článku 2846. E-ISSN 1996-1944
R&D Projects: GA ČR(CZ) GA17-07559S
Institutional support: RVO:68378271
Keywords : FeAlSi * intermetallic alloys * mechanical alloying * spark plasma sintering * microstructure * nanoindentation * mechanical properties
OECD category: Materials engineering
Impact factor: 3.057, year: 2019
Method of publishing: Open access

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.
Permanent Link: http://hdl.handle.net/11104/0307212