Thermodynamic metal crystallization basics
https://doi.org/10.21122/1683-6065-2020-2-8-11
Abstract
On the basis of thermodynamic calculations it is shown that crystallization of metals is a thermodynamic process, which takes place mainly at constant temperature. The exception is crystallization at very high cooling rates of the metal melt when the released solidification heat is not enough to stabilize the crystallization temperature of the liquid metal. In crystallization, the specific interfacial surface energy of crystals is not a constant value, but is proportional to their dimensions (bend radius).
Nanocrystals of crystallizing phases exist in the metal melt steadily. Metal crystallization aggregates nanocrystals and free metal melt atoms into microcrystals. Mechanism of dendritic crystallization of metals is proposed.
About the Authors
E. I. Marukovich
Institute of Technology of Metals of National Academy of Sciences of Belarus
Belarus
11, Bialynitskogo-Biruli Str., Mogilev, Belarus
Belarus
11, Bialynitskogo-Biruli Str., Mogilev, Belarus
V. Yu. Stetsenko
Institute of Technology of Metals of National Academy of Sciences of Belarus
Belarus
11, Bialynitskogo-Biruli Str., Mogilev, Belarus
Belarus
11, Bialynitskogo-Biruli Str., Mogilev, Belarus
References
1. . Chalmers B. Teoriya zatverdevaniya [Theory of hardening] . Moscow, Metallurgiya Publ ., 1968 . 288 p .
2. . Zhuhovickij A. A., Shvarcman L. A. Fizicheskaya himiya [Physical chemistry] . Moscow, Metallurgiya Publ ., 1968 . 520 p .
3. . Marukovich E. I., Stetsenko V. Yu. Modificirovanie splavov [Modifying of alloys] . Minsk, Belaruskaya navuka Publ ., 2009 .
4. p .
5. . Svojstva elementov. Fizicheskie svojstva: spravochnik [Properties of elements . Physical properties: reference] . P . 1 . Moscow, Metallurgiya Publ ., 1976 . 600 p .
6. . Dahlborg U., Besser M., Calvo–Dahlborg M. et al. Structure of molten Al–Si alloys . Journal of Non–Crystalline Solids, 2007, vol . 353, pp . 3005–3010 .
7. . Dahlborg U., Kramer M. J., Besser M. et al. Structure of molten Al and eutectic Al–Si alloy studied by neutron diffraction . Journal of Non–Crystalline Solids, 2013, vol . 361, pp . 63–69 .
Review
For citations:
Marukovich E.I., Stetsenko V.Yu. Thermodynamic metal crystallization basics. Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY). 2020;(2):8-11. (In Russ.) https://doi.org/10.21122/1683-6065-2020-2-8-11
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