Structural engineering and functional properties of vacuum-arc coatings of high-entropy (TiZrNbVHf)N and (TiZrNbVHfTa)N alloys nitrides

Sobol V., Dur O., Postelnyk A. A., Kraievska Z.

FUNCTIONAL MATERIALS, cilt.26, sa.2, ss.310-318, 2019 (ESCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 26 Sayı: 2
  • Basım Tarihi: 2019
  • Doi Numarası: 10.15407/fm26.02.310
  • Dergi Adı: FUNCTIONAL MATERIALS
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus
  • Sayfa Sayıları: ss.310-318
  • Anahtar Kelimeler: high-entropy alloys, coatings, nitrogen pressure, bias potential, texture, abrasive wear, PHASE, STATE
  • Gazi Üniversitesi Adresli: Hayır

Özet

The effect of nitrogen pressure during the deposition of vacuum-arc (TiZrNbVHf)N and (TiZrNbVHfTa)N coatings on their phase-structural state, substructure and resistance to abrasive wear was investigated. It was established that in multi-element (based on high-entropy alloys) (TiZrNbVHf)N and (TiZrNbVHfTa)N coatings obtained in a nitrogen atmosphere in the range of nitrogen pressures P-N = 2.5.10(-4)-4.5.10(-3) Tarr, a single-phase state is formed (based on cubic crystal lattice of structural type NaCI). The use of a multi-element composition with a single-phase state with a cubic lattice allows for (Ti-V-Zr-Nb-Hf-Ta)N coatings to achieve high microstrain values (up to 1.2 %) at low deposition pressure. It was found that high-entropy nitride coatings with low abrasive wear are characterized by a crystallite grain size of less than 50 nm, the absence or low level of texture perfection [111], and the presence of a rather high microstrain in crystallites (reaching 1.2 %). The reasons for the observed changes in the structural state and substructure of multi-element nitride coatings and their effect on abrasive resistance are discussed.