Gradient changes in structural condition of the B2 phase of NiTi surface layers after electron-beam treatments

Ludmila L. Meisner, Ekaterina Yu Gudimova, Marina G. Ostapenko, Aleksandr I. Lotkov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Structural conditions of the B2 phase of the Ti49.5Ni50.5 alloy surface layers before and after electron-beam treatments (pulse durationτ = 150 μs, number of pulses n = 5, beam energy density E≥ 20 J/cm2) were studied by X-ray diffraction analysis. Analysis of the X-ray patterns demonstrates that surface layers modified by electron beam treatment contain phase with B2surf structure. It is revealed that the lattice parameter of the B2surf phase in the surface (modified) layer is also higher than the lattice parameter of the B2surf phase in the underlying layer (αB2 = 3.0159 ± 0.0005). The values of lattice parameter of phase B2surf amounted αB2 surf = 3.0316 ± 0.0005 Å and αB2 surf = 3.0252 ± 0.0005 Å, for the specimens after electron-beam treatment at E1 = 15 J/cm2 and E2 = 20 J/cm2, respectively. Inflated lattice parameters α B2 surf surf are associated with changes in the chemical composition and the presence of residual stresses in the surface region of the samples after electron-beam treatments.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
PublisherAmerican Institute of Physics Inc.
Pages407-410
Number of pages4
Volume1623
ISBN (Print)9780735412606
DOIs
Publication statusPublished - 2014
EventInternational Conference on Physical Mesomechanics of Multilevel Systems 2014 - Tomsk, Russian Federation
Duration: 3 Sep 20145 Sep 2014

Other

OtherInternational Conference on Physical Mesomechanics of Multilevel Systems 2014
CountryRussian Federation
CityTomsk
Period3.9.145.9.14

Keywords

  • B2 phase
  • Electron-beam treatments
  • NiTi
  • Structural phase states
  • X-ray diffraction analysis

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Meisner, L. L., Gudimova, E. Y., Ostapenko, M. G., & Lotkov, A. I. (2014). Gradient changes in structural condition of the B2 phase of NiTi surface layers after electron-beam treatments. In AIP Conference Proceedings (Vol. 1623, pp. 407-410). American Institute of Physics Inc.. https://doi.org/10.1063/1.4898968