Model of nanostructure formation in Al-Si alloy at electron beam treatment

Vladimir Sarychev, Sergey Nevskii, Sergey Konovalov, Alexey Granovskii, Yurii Ivanov, Victor Gromov

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The paper reports on analysis of mechanisms and development of a mathematical model describing the effect of low-energy high-current electron beams on eutectic Al-Si alloy. The paper highlights the relationship between the effect of electron beams and formation of a gradient multilayer structure in the item to be treated. The surface layer has a structure of columnar crystallization; its cross sizes vary 200 to 600 nm. The principal mechanism forming the columnar structure is suggested to be a thermocapillary instability arising due to the gradient of temperature in the melted layer. It leads to vortices, pointing this way at formation of a structure with cellular crystallization. The linear analysis of this instability versus weak harmonic disturbances revealed that the wavelength with the maximal disturbance decrement is almost similar to the cross sizes of crystallization columns.

Original languageEnglish
Article number026540
JournalMaterials Research Express
Volume6
Issue number2
DOIs
Publication statusPublished - 1 Feb 2019

Keywords

  • columnar structure
  • electron beam treatment
  • electron microscopy
  • light metals
  • model
  • thermocapillary instability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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