Production of single-phase intermetallic films from Ru-Al multilayers

Single-phase RuAl is a promising candidate for protective coating materials which are used in applications that demand high oxidation resistance at elevated temperatures. The principal advantage of this system over other B2-aluminides emerges from the coefficient of thermal expansion (CTE), which is...

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Bibliographic Details
Published in:Surface & coatings technology 2014-04, Vol.244, p.210-216
Main Authors: Guitar, M.A., Aboulfadl, H., Pauly, C., Leibenguth, P., Migot, S., Mücklich, F.
Format: Article
Language:English
Subjects:
Adhesion
Aluminum
Annealing
Cross-disciplinary physics: materials science
rheology
Demand
Exact sciences and technology
Intermetallics
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Microstructure
Multilayers
Oxidation resistance
Phase evolution
Physics
RuAl thin film
Scratch tests
Surface treatments
Thermal cycling
Thermal expansion
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Summary:Single-phase RuAl is a promising candidate for protective coating materials which are used in applications that demand high oxidation resistance at elevated temperatures. The principal advantage of this system over other B2-aluminides emerges from the coefficient of thermal expansion (CTE), which is almost identical to that of α-Al2O3. The adherence of the alumina to RuAl is improved during thermal cycling conditions by decreasing the CTE mismatch between RuAl and its protective oxide. The present work describes the microstructural and physical characterisation carried out on RuAl thin films formed from multilayers (MLs) possessing very small periods of about ~2nm. Stainless steel was selected as substrate due to its technical relevance. XRD and TEM analysis of the as-sputtered films showed the presence of Ru, Al and RuAl phases, whereas atom probe tomography revealed the presence of both intermixed and multilayered zones. In-situ XRD measurements during the annealing displayed the direct formation of the single-phase RuAl from the MLs. Moreover, scratch tests confirmed the good adhesion of the films to the substrate. •Synthesis of a single-phase of RuAl thin films from multilayers was studied.•As-sputtered and annealed films were microstructurally characterised.•Phase evolution during annealing was analysed.•Film/substrate adhesion was evaluated by scratch tests.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2014.02.022