Formation of alpha-approximant and quasicrystalline Al-Cu-Fe thin films
نویسندگان
چکیده
Multilayered Al/Cu/Fe thin films have been deposited by magnetron sputtering onto Si and Al2O3 substrates with a nominal global composition corresponding to the quasicrystalline phase, 5:2:1. Subsequent annealing was performed on samples up to 710 °C. It is found that when using Si as substrate a film-substrate reaction occurs already below 390 °C, where Si diffuses into the film. This changes the composition, promoting the formation of the αapproximant Al55Si7Cu25.5Fe12.5 in the temperature range 400 to 650 °C over the quasicrystalline ψ-phase. When annealing the same Al-Cu-Fe thin film grown on Al2O3 substrates the Al62.5Cu25Fe12.5 icosahedral quasicrystalline phase is formed.
منابع مشابه
Oxidative and tribological properties of amorphous and quasicrystalline approximant Al-Cu-Fe thin films.
The origins of the tribological properties and corrosion resistance of amorphous and quasicrystalline approximant alloys have been studied by comparing their properties in thin Al-Cu-Fe alloy films with compositions lying near the quasicrystalline region of the ternary compositional phase diagram. Six sputtered thin films of an Al-Cu-Fe alloy were studied using X-ray diffraction, X-ray photoemi...
متن کاملIn situ studies of magnetron sputtered Al–Cu–Fe–Cr quasicrystalline thin films
In situ studies have been performed on thin films in the Al rich region of the Al–Cu–Fe–Cr quasicrystalline phase field. Thin films were grown by magnetron sputtering on atomically flat MgO (0 0 1) and Al O (0 0 0 1) and subsequently studied by 2 3 transmission electron microscopy and X-ray photoelectron spectroscopy. High resolution electron microscopy shows that thin films (-30 nm) grown at r...
متن کاملMicrostructural evolution in Al–Cu–Fe quasicrystalline thin films
Transmission electron microscopy (TEM) was performed to study the microstructural evolution in Al–Cu–Fe quasicrystalline thin films. Thin films were grown by magnetron sputtering on sodium chloride crystals, which were subsequently dissolved in water to acquire free-standing films. Studies were conducted on the as-deposited sample, and samples that were annealed at 400 8C in Argon and 500 8C in...
متن کاملStable Quasicrystalline Phase in Al-Cu-Fe-Cr Coating Materials
Transmission electron microscopy (TEM) studies have been carried out on magnetron-sputtered coatings in the Al-rich region of the Al-Cu-Fe-Cr quasicrystalline phase field, focusing on the composition that exhibited the best tribological performance among a group of sputtered coatings. The size of the particles in the as-deposited coating is around 10 nm. The TEM experiments on annealed coatings...
متن کاملCoincidence of reciprocal lattice planes model for quasicrystal-crystal epitaxy
A coincidence of reciprocal lattice planes model was developed to calculate the interfacial energy in quasicrystal-crystal epitaxy. This model allows a quantitative description of the interface as opposed to previously employed qualitative models that consider symmetry relations and alignment of rotation axes. Computations were carried out on several types of quasicrystal-crystal systems, namel...
متن کامل