Crystallization of aluminum droplet at low supercooling: theoretical analysis by homogeneous nucleation model

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F22%3A00561156" target="_blank" >RIV/68378271:_____/22:00561156 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Crystallization of aluminum droplet at low supercooling: theoretical analysis by homogeneous nucleation model

Original language description

Crystallization in an undercooled Aluminum (Al) droplet occurs via the formation of crystalline nuclei by homogeneous or heterogeneous nucleation and successive growth of nuclei. Crystallization event at low undercooling 6.4 oC of 9.91 mg of a compact Al sample was detected using isothermal differential scanning calorimetry (DSC) after several tenths of minutes. Standard analysis based on Johnson-Mehl-Avram-Kolmogorov (JMAK) model is not appropriate in this case as Avrami parameter n, which is closely connected to the dimensionality of the system, is too low to fit the crystallization data via JMAK model. Al growth rate is extremely high and that is why we presume that the time delay of crystallization, detected by DSC, is slightly higher than nucleation time delay. A homogeneous nucleation model is applied to determine the basic characteristics of nucleation: the size distribution of nuclei, nucleation rate, total number of nuclei and crystallization fraction at the nucleation process. The number of atoms in a liquid Aluminum droplet decreases with time as the formation of a new crystalline phase occurs. As a consequence, a decrease in stationary nucleation occurs.n

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/EF16_019%2F0000760" target="_blank" >EF16_019/0000760: Solid State Physics for 21st century</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů