Features of the influence of thermal modes of cooling on processes of nonequilibrium crystallization of materials from the liquid state

Башев, В. Ф.; Ryabtsev, S. I.; Antropov, S. N.; Kutseva, N. A.; Kushnerev, O. I.; Skorbyaschensky, E. S.

doi:10.15421/331822

Cited by 2 publications

(6 citation statements)

References 4 publications

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“…As-cast alloy with a nominal composition of Al 65 Cu 20 Fe 15 (in atomic percent) cooled at a rate of 5 K/s was prepared by melting a mixture of high purity (99.99 %) Al, Cu, Fe in alumina crucibles [9]. As-sputtered Al 60 Cu 28 Fe 12 film was deposited on NaCl substrate by the modernized method of three-electrode ion-plasma sputtering [7,8].…”

Section: Methodsmentioning

confidence: 99%

“…In deposition of quasicrystalline coatings, it is essential to monitor the rates of sputtered atoms which have a considerable dispersion not only in magnitude but also in direction. An acceleration of ions impinging on the target and, correspondingly, an increase in their kinetic energy by factors of 5 to 6 can be achieved by using a modernized method of ion-plasma sputtering [7,8]. This method ensures a more uniform mixing of components upon their deposition on the substrates.…”

Section: Introductionmentioning

confidence: 99%

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Structure and corrosion in NaCl solution of quasicrystalline Al–Cu–Fe cast alloys and thin films

2019

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For the first time, quasicrystalline Al60Cu28Fe12 films with 260 nm thickness cooled at 1012–1014 K/s were produced by the modernized method of three-electrode ion-plasma sputtering. Films were deposited on NaCl substrate. The structure of as-sputtered films was investigated in comparison with that of as-cast specimens by methods of quantitative metallography, X-ray analysis, and scanning electron microscopy. Corrosion behavior in 5% NaCl aqueous solution was studied by potentiodynamic method and model tests. In the structure of the as-cast Al–Cu–Fe alloy, the quasicrystalline icosahedral i-phase was established to co-exist with λ -Al13Fe4 , τ-AlCu(Fe), η-AlCu, and θ-Al2Cu crystalline phases and occupy ~56 % of the alloy volume. The Al–Cu–Fe film contains dispersive quasicrystalline i-phase (~3 nm in size) that is stable up to 723 К. Corrosion of the as-sputtered Al–Cu–Fe film runs at the lower rate as compared with that of the as-cast alloy of the same composition. Model corrosion tests for 1, 2, 3, 4, 8 days with 5% NaCl solution at 293 K indicate that the investigated Al–Cu–Fe film remains virtually untouched by corrosion. No marks of pittings typical for as-cast Al–Cu–Fe alloys are observed on the film surface affected by saline solution.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and corrosion in NaCl solution of quasicrystalline Al–Cu–Fe cast alloys and thin films

2019

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“…There are some following stable tungsten boride phases known from experiments in W-B system: W2B, WB (α and  phases), WB2, W2B5, and WB4, synthesized by arc melting [7,8] (see tungsten boride phases known from experiments with W-B system in 1990th, as well as the binary alloy phase diagrams of Refs. in [5]).…”

Section: Stable Tungsten Boride Phasesmentioning

confidence: 98%

“…in [2]), Ti [2], which seems to have led the authors to describe new phases at the atomic level [3], to simulate crystallization by the molecular dynamics method [4], to form structures at mass crystallization of amorphous alloys, to study multicomponent high-entropy alloys (Refs. in [5]), the special and rapid modes quenching from liquid and vapor states [6], as well as modeling of metastable phases (Refs. in [5]), in particular, by modernized methods of ion-plasma sputtering [5].…”

Section: Introductionmentioning

confidence: 99%

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Metastable States and Physical Properties of Boron-rich W-B films

Башев¹,

Ryabtsev²,

Kruzina³

et al. 2020

J. Nano- Electron. Phys.

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The experimental data on the ion-plasma (13.56 MHz) magnetron sputtering of composite targets of the system W-B are presented. Application of this method allows one to obtain deposited alloys in the entire concentration range of compositions. The as-deposited films show the formation of an amorphous solid state. The decomposition of an amorphous state is accompanied by precipitation of an intermediate metastable, nanocrystalline W-phase with FCC-structure. By applying magnetron sputtering, we have obtained an amorphous state in pure W-films at room temperature. The thermal stability, electrical and mechanical properties of metastable states in W-B films are studied. The study shows that the amorphous state in the WB5 alloy is characterized by abnormally high temperature stability and microhardness. The ion-plasma sputtering method has demonstrated its effectiveness in the case of tungsten films, showing the possibility of obtaining metastable phases in them. At the same time, the obtained values of microhardness in the amorphous alloy turned out to be lower than the predicted maximum theoretical values due to the peculiarities of the location of atoms in the alloy.

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Features of the influence of thermal modes of cooling on processes of nonequilibrium crystallization of materials from the liquid state

Cited by 2 publications

References 4 publications

Structure and corrosion in NaCl solution of quasicrystalline Al–Cu–Fe cast alloys and thin films

Structure and corrosion in NaCl solution of quasicrystalline Al–Cu–Fe cast alloys and thin films

Metastable States and Physical Properties of Boron-rich W-B films

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