Relationship between chemical and icosahedral local orderings in Al-Ni-Fe melts

Roik, O.S.; Samsonnikov, A. V.; Kazimirov, V. P.; Sokol’skii, V. È.

doi:10.1134/s0022476611020107

Cited by 1 publication

(4 citation statements)

References 21 publications

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“…Based on the data of [13] and the above results, it can be argued that a temperature of ≈ 500 C is optimal for the transition from the amorphous to the quasicrystalline phase.…”

Section: Resultsmentioning

confidence: 88%

“…It is noteworthy that the hollow between the first and second maxima in the initial state reaches almost the background level, and after annealing it coincides with the background. Such a feature is not characteristic of the classical RDF dependences for amorphous metals [17], as well as for molten metals and alloys [11][12][13]. According to [11], such an "almost completely isolated first peak" is due to the fact that in crystals the distances between atoms are much more defined compared to a melt.…”

Section: Resultsmentioning

confidence: 99%

“…It is also important to pay attention to the fact that the first maximum is not symmetrical, but has a "tail" in the direction of lower r values. According to [13], the presence of a "pre-peak" in the first maximum may also indicate the existence of correlations in the arrangement of structural units at distances exceeding the sizes of the nearest environment. The second maximum also appears asymmetrical (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The mathematical processing of diffraction patterns with halos was carried out according to the standard method for finding the radial distribution functions (RDF) of amorphous substances. For multicomponent alloys, it is possible to calculate the radii of the first coordination spheres and the average number of nearest neighbors [11][12][13]. When constructing the interference function, the 04011-2 following corrections were introduced to the measured Xray radiation intensity: dispersion corrections to atomic scattering factors, corrections for polarization, absorption, Compton (incoherent) scattering, also the intensity curve was normalized.…”

Section: Objects and Methodsmentioning

confidence: 99%

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Features of the Initial Stage of the Formation of Ti-Zr-Ni Quasicrystalline Thin Films

Malykhin¹,

Кондратенко²,

Kopylets³

et al. 2020

J. Nano- Electron. Phys.

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Using the methods of X-ray diffraction, transmission and scanning microscopy, the features of the initial stage of the formation of the quasicrystalline phase in thin films of Ti-Zr-Ni are studied. The films were obtained by magnetron sputtering of a target of the composition Ti41Zr38.3Ni20.7 (at. %) with deposition on substrates at T  300 K and further vacuum annealing. It was established that immediately after deposition, the films are X-ray amorphous, nanostructured. An analysis of the radial distribution functions shows that immediately after deposition, the structural state of a disordered cluster, which is topologically close to icosahedral, prevails in the near atomic medium. It is concluded that the atoms are not arranged randomly, but form a "transitional" structure with an imperfect order like three shells of the Bergman cluster stacking using icosahedrons and dodecahedrons. Such a structure is a "prepared" nucleus for the further formation of the icosahedral phase upon heating. An analysis of the annealing results suggests that the qualitative nature of the transition from the pseudo-amorphous to the quasicrystalline phase and the scale of the transformations are determined by the annealing time and temperature, as well as by the film thickness. The smaller the thickness, the more the annealing processes are inhibited. It was shown that by annealing the films of a thickness of 6 μm or more at 500 C for more than 28 h, single-phase quasicrystalline coatings with a quasicrystallinity parameter aq of about 0.5245 nm can be obtained.

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“…Based on the data of [13] and the above results, it can be argued that a temperature of ≈ 500 C is optimal for the transition from the amorphous to the quasicrystalline phase.…”

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Objects and Methodsmentioning

confidence: 99%

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