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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.2015013490
pages 91-99

MODIFICATION OF Al−20%Si HYPEREUTECTIC ALLOY STRUCTURE BY COMPRESSION PLASMA FLOW TREATMENT

Nikolai N. Cherenda
Belarusian State University, 4 Nezavisimost Ave., Minsk, 220030, Belarus; South-Urals State University, 76 Lenin Ave., Chelyabinsk, 454080, Russia
Vladimir V. Uglov
Belarusian State University, 4 Nezavisimost Ave., Minsk, 220030, Belarus; National Research Tomsk Polytechnic University, 2a Lenin Ave., Tomsk, 634028, Russia
A. P. Laskovnev
Presidium of the National Academy of Sciences of Belarus, Minsk, Belarus
S. V. Gusakova
Belarusian State University, 4 Nezavizimost Ave., Minsk, 220030, Belarus
Valiantsin M. Astashynski
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus; National Research Nuclear University "MEPhI" (Moscow Engineering Physics Institute), 31 Kashirskoe Highway, Moscow, 115409, Russia
A. M. Kuzmicki
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus

ABSTRACT

The structure of the Al−20%Si hypereutectic alloy surface layer modified by compression plasma flows is investigated. Compression plasma flows are generated in a nitrogen atmosphere by a magnetoplasma compressor of compact geometry. Plasma impact leads to dissolution of intermetallides and primary Si crystals and to the formation of an oversaturated solid solution on the basis of the f.c.c. Al lattice containing Si atoms. The high cooling rate of the melt resulted in structure refinement of the surface layer. An additional modification of the surface layer is carried out by its alloying with Ti atoms under plasma impact. Structural changes provided an increase in the aluminum alloy microhardness. Main trends in structure transformation after plasma treatment are discussed.