Structure, phase composition and properties of surface layers of the titanium after electroexplosive doping with yttrium and electron-beam processing

V. E. Gromov, K. V. Sosnin, Yu F. Ivanov, O. A. Semina

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Modification of surface layer of technically pure titanium is carried out by the combined method combining electroexplosive doping with yttrium and subsequent irradiation by high-intensity electron beam with parameters as follow: energy density of electron beam-20-70 J/cm2, pulse length-150 μs, number and pulse frequency-3 and 0.3 Hz, respectively. The investigations of elemental and phase compositions, defect substructure, mechanical and tribological characteristics of the doped layer are performed via the contemporary methods of physical materials science (X-ray structural analysis, optical, scanning and transmission electron diffraction microscopies, measurements of microhardness, friction coefficient and wear rate). The formation of multilayer multiphase submicro- and nanocrystalline structure characterized by titanium and yttrium layering is revealed. The 500 nm thick surface layer is amorphous. The 1.0-1.5 μm thick layer is located below and has a columnar structure. Under it, the extended layer (of 20-40 μm) with the structure of dendritic (globular) crystallization is determined. The amorphous layer is enriched with titanium, and the layer with columnar structure lying under it is yttrium-enriched. The main phase of the surface layer is α- yttrium (73% of the volume fraction). The volume fraction of other phases is considerably lesser (α-titanium-10%, carbide TiC and titanium oxide TiO2-14%, yttrium oxide Y2O3-3%). The saturation of titanium surface layer with yttrium, oxygen and carbon atoms results in the formation of metalloceramic layer hardened by oxides and carbides of titanium and yttrium and facilitates the multiple increase in microhardness (more than 3 times as much), reduction of friction coefficient (more than 7 times) and wear rate of modified layer (more than 3 times).

Original languageEnglish
Pages (from-to)175-227
Number of pages53
JournalUspehi Fiziki Metallov
Volume16
Issue number3
DOIs
Publication statusPublished - 1 Jul 2015

Fingerprint

Yttrium
Titanium
yttrium
Phase composition
Electron beams
surface layers
titanium
Doping (additives)
electron beams
Processing
Microhardness
Carbides
Volume fraction
carbides
microhardness
coefficient of friction
Wear of materials
Friction
Yttrium oxide
Titanium oxides

Keywords

  • Electroexplosive doping with yttrium
  • Electron-beam processing
  • Surface properties
  • Titanium structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science (miscellaneous)
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys

Cite this

Structure, phase composition and properties of surface layers of the titanium after electroexplosive doping with yttrium and electron-beam processing. / Gromov, V. E.; Sosnin, K. V.; Ivanov, Yu F.; Semina, O. A.

In: Uspehi Fiziki Metallov, Vol. 16, No. 3, 01.07.2015, p. 175-227.

Research output: Contribution to journalArticle

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