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

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

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

Projekt

<a href="/cs/project/EF16_019%2F0000760" target="_blank" >EF16_019/0000760: Fyzika pevných látek pro 21. století</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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