A comprehensive description of reactions between nickel and aluminum powders during reactive sintering

0549583 - FZÚ 2022 RIV CH eng J - Journal Article
Školáková, Andrea - Körberová, J. - Kratochvíl, P. - Salvetr, P. - Deduytsche, D. - Novák, P.
A comprehensive description of reactions between nickel and aluminum powders during reactive sintering.
Materials Chemistry and Physics. Roč. 271, Oct. (2021), č. článku 124941. ISSN 0254-0584. E-ISSN 1879-3312
Institutional support: RVO:68378271
Keywords : kinetics * reactive sintering * nickel aluminides * intermetallics
OECD category: Materials engineering
Impact factor: 4.778, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.matchemphys.2021.124941

In this work, Ni–14Al, Ni–30Al and Ni–58Al alloys representing Ni3Al, NiAl and NiAl3 phases were studied. They were prepared by reactive sintering to show which phases are present in the obtained microstructure. Subsequently, reactions between nickel and aluminum were observed below and above the melting point of aluminum allowing to propose reaction mechanism and to determine kinetics. Experiments below melting point were carried out as annealing of the powder mixture and phase composition was studied while experiments at higher temperatures used special experimental model consisting bulk nickel and molten aluminum. Results showed that Ni2Al3 phase formed preferentially in all alloy composition and the whole process was controlled by diffusion. Its preferential formation was confirmed by annealing of powder mixture and by the experimental model as well. The appropriate ongoing reactions were compiled for each alloy with calculated Gibbs energy and enthalpy of reaction.
Permanent Link: http://hdl.handle.net/11104/0325592