The Special Features of the Phase Formation and Distribution in the Titanium Nickelide Surface Layers Treated by Electron Beams

L. L. Meisner, M. G. Ostapenko, A. I. Lotkov, [No Value] Neyman

Результат исследований: Материалы для журналаСтатья

Аннотация

The special features inherent in the formation of the structural-phase states on the surface of titanium nickelide samples subjected to multiple low-energy high-current variable energy density pulsed electron beam irradiation are investigated. The parameters of the electron beam operated in the fivefold surface melting regime are as follows: pulse duration τ = 150 μs, current I = 70 А, and energy densities Е<inf>1</inf>, Е<inf>2</inf>, and E<inf>3</inf> = 15, 20, and 30 J/сm<sup>2</sup>, respectively. The surface layer structure was examined by methods of the x-ray diffraction analysis and transmission electron microscopy. It is found that in the irradiated TiNi samples with Е ≤ 20 J/сm<sup>2</sup>, the layer containing a martensite phase lies at a certain depth below the surface rather than on the surface. In the irradiated TiNi sample with E<inf>3</inf> = 30 J/сm<sup>2</sup>, the subsurface region is in a two-phase state (B2 + B19′), with the В19′ phase being predominant. It appears that the lower is the energy density, the smaller is the amount of the martensite phase.

Язык оригиналаАнглийский
ЖурналRussian Physics Journal
DOI
СостояниеПринято/в печати - 17 сен 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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