Modification of structure and surface properties of hypoeutectic silumin by intense pulse electron beams

Yu F. Ivanov, V. Gromov, S. V. Konovalov, D. V. Zagulyaev, Petrikova, P. Semin

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Methods of contemporary physical materials science are applied for the analysis of structural and phase states, tribological and mechanical properties of hypoeutectic silumin treated by electron beams with parameters as follow: energy density - 10-35 j/cm2, pulse duration - 10 µs, number of pulses - 3, pulse-repetition frequency - 0.3 Hz. The initial structure of silumin comprises grains of aluminium-based solid solution, eutectic grains, inclusions of silicon and intermetallic compounds with different shapes and sizes. Electron beam treatment (EBT) with energy density of 20-35 j/cm2 causes melting of the surface layer, dissolution of silicon inclusions and intermetallic compounds. A structure of high-speed cellular crystallization is formed, and submicro- and nanosize particles of the second phase are reprecipitated. An average size of crystallization cells are of 0.3-0.5 µm at the irradiated surface and of 0.4-0.8 µm on the lower edge of the layer with the cellular structure. The graded structure and phase states are analysed at a depth of up to 120 µm. The submicron grains of lamellar eutectic are detected at a depth of 15 µm. The lateral sizes of eutectic lamellae are within the range of 25-50 nm. The study indicates that nanohardness of irradiated silumin changes nonmonotonously and reaches its maximum at a depth of about 30 µm, which is approximately four times higher than hardness in the initial state. Hardness of the layer close to the irradiated surface (that is at a depth of ≈5 µm) is higher by a factor of ≈1.6 than that of as-cast silumin. The paper provides physical interpretation of the changes occurring in structure and properties during irradiation.

Original languageEnglish
Pages (from-to)195-222
Number of pages28
JournalUspehi Fiziki Metallov
Volume19
Issue number2
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Cells of high-speed crystallization
  • Electron beams
  • Eutectic
  • Hypoeutectic silumin
  • Intermetallic compounds
  • Nanohardness

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science (miscellaneous)
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys

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