On the formation of intermetallics in Fe-Al system – an in situ XRD study
Pavel Novák1, Alena Michalcová1, Ivo Marek1, Martina Mudrová2, Karel Saksl3, Jozef Bednarčík4, Petr Zikmund5, Dalibor Vojtěch1
1Vysoká škola chemicko-technologická v Praze, Ústav kovových materiálů a korozního inženýrství, 2Vysoká škola chemicko-technologická v Praze, Ústav počítačové a řídící techniky, 3Ústav materiálového výskumu Slovenskej Akadémie Vied, Košice, Slovensko, 4Deutsches Elektronen-Synchrotron (HASYLAB), Hamburg, Německo, 5ČVUT Praha, Ústav strojírenské technologie
Intermetallics 32 (2013) 127-136 IF=1.857
Reactive powder metallurgy starting from pure metallic powders is one of the alternatives of intermetallic compounds production. I some alloy systems, as e.g. Fe-Al, this method fails due to high porosity and heterogeneity of the product. Reasons for this behaviour were not successfully described up to this work, since the reactions proceed at high temperatures and very quickly. This work uses in-situ methods (diffraction of synchrotron high-energy X-rays with high-speed detection, thermal analysis) for the determination of the mechanism of proceeding reactions. This paper is the world’s first work, where the mechanism of reactions in Fe-Al system was described complexly in dependence on the process parameters (temperature, heating rate, duration of reactive sintering process). Obtained results show the way how the reactive sintering powder metallurgy could be applied in production of FeAl alloys.
The workers of ICT Prague carried out most of the experimental works including in-situ experiments and their evaluation. This work is a part of continuous research lead by P. Novák. A. Michalcová planned and realized the XRD experiments together with P. Novák. A. Michalcová, I. Marek and M. Mudrová treated the results by visualization and software analysis. P. Novák was responsible for the experimental model experiments for the description of the process kinetics. D. Vojtěch helped with the processing of the kinetics data and evaluation of the results. Other co-authors outside ICT Prague worked as technical support during in-situ experiments (K.Saksl, J. Bednarčík) and measurement by thermal camera (P.Zikmund).