MECHANISM OF INFLUENCE OF NANOSECOND ELECTROMAGNETIC PULSES ON CRYSTALLIZATION BEHAVIOR OF ALUMINUM ALLOYS

1 DEEV Vladislav
Co-authors:
2 RI Ernst 3 PRUSOV Evgeny
Institutions:
1 National University of Science & Technology MISIS, Moscow, Russian Federation, deev.vb@mail.ru
2 Pacific National University, Khabarovsk, Russian Federation, erikri999@mail.ru
3 Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russian Federation, eprusov@mail.ru
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1363-1368
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
12 views / 1 download
Abstract

It is shown from the point of view of the quasicrystalline model of metallic melts that during the liquid phase treatment by nanosecond electromagnetic pulses it may be possible the occurrence of energy fluctuations in the melt, change of short-range order structure in the atoms arrangement, reducing the cluster size and shortening their lifespan, decreasing the disordering temperature. These processes change the physical properties of the melt, crystallization parameters, physical-mechanical and operational properties of the obtained alloys. It is theoretically justified that irradiation of the melt with nanosecond electromagnetic pulses, by reducing the surface energy of an interphase boundary "crystal-melt" and contributing to increase in degree of the melt undercooling, increases the formation rate of nucleation centers in a unit volume of the melt and provides the refinement of microstructure of resulting castings. In addition, increasing the wettability of solid particles by the melt and reducing the surface tension at the interphase boundaries leads to substantial dispersion of nonmetallic inclusions and intermetallic phases, which causes the formation of additional crystallization centers. It is assumed that when the nanosecond electromagnetic pulses are applied to the liquid phase, the bond energy curve shifts toward a lower value of the interatomic distance, while the absolute value of the bond energy decreases. For this reason, the melt irradiation provides the possibility of an energetically and kinetically easier moving of atoms from one stable state to another, which accelerates diffusion processes and deactivates clusters.

Keywords: Electromagnetic pulses, aluminum alloys, crystallization, bond energy, quasicrystalline model
Scroll to Top