Crystallization of aluminum droplet at low undercooling: homogeneous nucleation approach

0566993 - FZÚ 2023 RIV GB eng C - Conference Paper (international conference)
Kožíšek, Zdeněk - Král, Robert - Zemenová, Petra
Crystallization of aluminum droplet at low undercooling: homogeneous nucleation approach.
Journal of Physics: Conference Series. Vol. 2413. Bristol: IOP Publishing, 2022, č. článku 012002. ISSN 1742-6588.
[DMSRE seminar: Development of Materials Science in Research and Education (DMSRE) /31./. Nová Lesná (SK), 05.09.2022-09.09.2022]
Institutional support: RVO:68378271
Keywords : crystallization * thermal analysis * nucleation * Aluminum
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
https://iopscience.iop.org/article/10.1088/1742-6596/2413/1/012002

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 in compact Al sample was detected using isothermal differential scanning calorimetry (DSC) after several tenths of minutes. In this case, standard analysis based on Johnson-Mehl-Avrami-Kolmogorov (JMAK) model is not appropriate as Avrami parameter n obtained by fitting of DSC data is too low. 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.
Permanent Link: https://hdl.handle.net/11104/0338541