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

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

Результат исследований: Материалы для журналаСтатья

6 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаАнглийский
Номер статьи026540
ЖурналMaterials Research Express
Том6
Номер выпуска2
DOI
СостояниеОпубликовано - 1 фев 2019

ASJC Scopus subject areas

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

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