About causes of slow relaxation of melted intermetallic alloys

Lebedev, V.G.; Shklyaev, K.Y.; Menshikova, S.G.; Vasin, M.G.

doi:10.1016/j.calphad.2023.102615

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…At the same time, it turns out that if such a region is created in the melt, it will be stable with respect to diffusion decay [35]. The formalism [34] allows to define the boundaries of this stability at the phase diagram [36]. When heated beyond this region, a rapid irreversible decay of the mentioned inhomogeneities starts.…”

Section: Resultsmentioning

confidence: 99%

Viscosity of Al–Ni–Co–Nd(Sm) glass-forming melts at high temperatures

Rusanova,

Rusanov,

Beltyukov

et al. 2024

J. Phys.: Condens. Matter

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Obtaining amorphous alloys with good mechanical and anticorrosion properties is an important problem of modern condensed matter physics. Since the preparation of amorphous alloys involves casting them from liquid state, information on the properties of the melts is needed. Viscosity is one of the most informative structure-sensitive property of melts. In this paper viscosity of some glass-forming Al-Ni-Co-Nd(Sm) melts with different ratio of transition metals was studied using damped oscillation method in a wide temperature range up to 1550 K. Activation energies of the viscous flow were calculated from the experimental data. The hysteresis of viscosity temperature dependences during heating and subsequent cooling was found. It can be associated with a melt transition to a more homogeneous state. The repeated heating and cooling of the melts without crystallization lead to Arrhenius type of viscosity temperature dependences.

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Section: Resultsmentioning

confidence: 99%

Viscosity of Al–Ni–Co–Nd(Sm) glass-forming melts at high temperatures

Rusanova,

Rusanov,

Beltyukov

et al. 2024

J. Phys.: Condens. Matter

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Local Structure and Solidification of Al-Ni-Co-REM Melts at High Pressure (up to 10 GPa)

Menshikova,

Chtchelkatchev

2024

CPM

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High pressure affects the solidification of glass-forming melts based on aluminum with transition and rare earth metals, allowing the synthesis of new metastable compounds that are stable for quite a long time under normal conditions. An attempt was made to connect high pressure with the glass-forming ability of melts. Using X-ray diffraction and electron microscopy methods, the effect of high pressure (up to 10 GPa) on the solidification of melts of complex multicomponent glass-forming alloys Al86Ni4Co4Gd6, Al86Ni2Co6Gd6, Al86Ni6Go4Gd2Er2, Al86Ni6Co4Gd2Tb2 with a temperature of 1800 K under conditions of rapid cooling was studied. The resulting samples are dense and homogeneous, with a fine-crystalline structure. Under high pressure conditions of 7-10 GPa, metastable crystalline phases were synthesized in alloys. Within the framework of the Ab-Initio Molecular Dynamics approach using density functional theory, the local structure of melts of selected alloys at low and high pressures was studied. The study of short-range order shows the presence of icosahedral clusters in melts, the formation of which is facilitated by rare earth metals. An increase in pressure from 0 to 10 GPa leads to an 8-fold increase in the concentration of icosahedra, resulting in the formation of a "percolation" cluster. It has been shown that the glass-forming ability of melts increases with increasing pressure, which affects the solidification processes. The arrangement of atoms in icosahedral clusters in melts promotes the formation of synthesized metastable crystalline phases in alloys.

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About causes of slow relaxation of melted intermetallic alloys

Cited by 2 publications

References 11 publications

Viscosity of Al–Ni–Co–Nd(Sm) glass-forming melts at high temperatures

Viscosity of Al–Ni–Co–Nd(Sm) glass-forming melts at high temperatures

Local Structure and Solidification of Al-Ni-Co-REM Melts at High Pressure (up to 10 GPa)

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