The effect of globule formation under electron-beam irradiation of multilayer systems

Principle investigators:

1. Markov Aleksey Borisovich, President’s advisor, PhD
2. Solovyov Andrey Veniaminovich, Senior Researcher, PhD. (andrio1974@gmail.com)
3. Yakovlev Evgeniy Vitalievich, Researcher. ( yakovev@lve.hcei.tsc.ru )
4. Petrov Vsevolod Ivanovich, Researcher. ( seva-ne@mail.ru )

The effect of globule formation has been found during the synthesis of a NiAl surface alloy by a single-pulse electron-beam irradiation of a three-layer coating on a steel substrate. The surface alloy structure has been a homogeneous film with globules located under it because of rapid convective and thermocapillary processes. They have resulted in pushing back the substrate material into separate parts of the coating, which have been transformed into ledges or globules during solidification. The effect has improved the adhesion of the formed surface alloy. This result has experimentally confirmed the presence of convective mixing in layers of micron and submicron thicknesses under irradiation with low-energy high-current electron beams.

Cross-sectional images of the NiAl surface alloy structure formed with the low-energy high-current electron beam.

Publication:

А.B. Markov, E. V. Yakovlev, D. A. Shepel’, A. V. Solov’ev, V. I. Petrov The synthesis of Ni–Al surface alloy by low-energy, high-current electron beam irradiation of composite coating // Russian Physics Journal. – 2019. – Vol. 62. – Issue 7. – P. 1298–1305.