Complex X-ray study of metal nanosystems, nanocomposites and high entropy alloys

Previous and Current Research

We are focused on fundamental aspects of synthesis and characterization of intermetallic compounds, metal based nanomaterials and nanocomposites as well as high entropy alloys. We study the crystal structure of mentioned systems and its effect on their physical properties (mechanical, magnetic, transport). We provide theoretical calculations of electronic structure of metal systems.

Isothermal cross-section of Ni-Al-Ga phase diagram at 973 K.

Due to a high melting temperature, extraordinary hardness and toughness combined with good electrical and thermal conductivity as well as excellent resistance to wear and abrasion, metal carbides are known to be widely used in some industrial applications as reinforcement additions for composite materials and for functional coatings improving the sharpness of cutting edges.

SEM micrographs of mechanically alloyed Me-CNT charge: x1000 (a), x10000 (б).

The nanoscaled mono- (powders) and complex (compacted nanocomposites) carbides of transition d-metals: TiC, ZrC, HfC, VC, NbC, TaC, YCx, Mo₂С, W₂C, WC, Fe₃C, Co₃C, and NiC_x have synthesized by mechanical alloying in a high-energy planetary ball mill from a charge containing the carbon nanotubes. The effect of multiwalled carbon nanotubes on reaction milling of the materials obtained has analyzed.

Calculated DOS spectra of Ni, Ni₄C (tetra.) and Ni₄C (octa.) calculated for the cubic carbide Ni_3.3C synthesized.

Future Projects and Goals

We are going to continue our study on crystal structure and properties of metal nanosystems, nanocomposites and high entropy alloys.

Methodological and Technical Expertise

• Arc melting technique;
• Mechanochemical synthesis of metal carbides, intermetallics and high entropy alloys;
• X-ray diffraction study;
• Experimental approaches for  characterization of materials: Faraday magnetometry, indentation technique, viscometry, etc.

Selected Publications

Scopus Author ID: 6602216570

ResearcherID: G-6701-2019

1.     Nakonechna, O. On the behaviour of indentation fracture in TiAlSiN hard thin films / O. Nakonechna, T. Cselle, M. Morstein, A. Karimi // Thin Solid Films. – 2004. – Vols. 447– 448, no. 30. – P. 406-412. https://doi.org/10.1016/S0040-6090(03)01072-1

2.     Belyavina, N.N. Crystal structures and magnetic properties of the BaAl₄-type structure derivatives in Gd-Al-Ga system / N.N. Belyavina, M.G. Babich, V.Ya. Markiv, O.I. Nakonechna, M.I. Zakharenko // Journal of Alloys and Compounds. – 2013. – Vol. 576. – P. 114-120. https://doi.org/10.1016/j.jallcom.2013.04.086

3.     Belyavina, N. Phase equilibria in the Ni-Al-Ga system at 700 °C / Belyavina N., Markiv V., Lozovyi F., Nakonechna O. // Journal of Alloys and Compounds. – 2014. – Vol. 593. – P. 41-49. https://doi.org/10.1016/j.jallcom.2014.01.073

4.     Belyavina, N. Crystal structure and magnetic properties of the DyCu_xGa_4-x-δ compounds with BaAl₄-type derivatives // N. Belyavina, V. Markiv, M. Babich, O. Nakonechna, V. Karbivskii // Journal of Alloys and Compounds. – 2016. – Vol. 677. – P. 178-184. https://doi.org/10.1016/j.jallcom.2016.03.250

5.     Boshko, O. Effect of the carbon nanotubes on structure and magnetic properties of the Fe–Cu (4:1) composites / O. Boshko, O. Nakonechna, M. Dashevskyi, К. Ivanenko, N. Belyavina, S. Revo // Advanced Powder Technology. – 2016. – Vol. 27, Issue 4. – P. 1101-1108. https://doi.org/10.1016/j.apt.2016.03.019

6.     Boshko, O. Nanocrystalline Fe–C composites obtained by mechanical alloying of iron and carbon nanotubes / O. Boshko, O. Nakonechna, N. Belyavina, M. Dashevskyi, S. Revo // Advanced Powder Technology. – 2017. – Vol. 28, Issue 3. – P. 964-972. https://doi.org/10.1016/j.apt.2016.12.026

7.     Dashevskyi, M. Phase Transformations in Equiatomic Y–Cu Powder Mixture at Mechanical Milling / M. Dashevskyi, О. Boshko, O. Nakonechna, N. Belyavina // Metallofiz. Noveishie Tekhnol. – 2017. – Vol. 39, no. 4. – P. 541—552. DOI:10.15407/mfint.39.04.0541

8.     Dashevskyi, M. On the features of mechanochemical synthesis of Y-Cu equiatomic powder mixture / M. Dashevskyi, N. Belyavina, O. Boshko, L. Kapitanchuk, O. Nakonechna, S. Revo // Advanced Powder Technology. – 2018. – Vol. 29, Issue 5. – P. 1106-1111. https://doi.org/10.1016/j.apt.2018.01.029

9.     Nakonechna, O. I. Effect of Carbon Nanotubes on Mechanochemical Synthesis of d-Metal Carbide Nanopowders and Nanocomposites / O. I. Nakonechna, M. M. Dashevskyi, О. І. Boshko, V. V. Zavodyannyi, N. N. Belyavina //
Usp. Fiz. Met. –2019. – Vol. 20, no. 1. – P. 5–51. https://doi.org/10.15407/ufm.20.01.005

10. Nakonechna, O.I. Parameters of crystal and electronic structure and magnetic properties of mechanically alloyed Ni₃C cubic carbide / O.I. Nakonechna, K.O. Ivanenko, A.M. Kuryliuk, N.N. Belyavina // Physics and Chemistry of Solid State. – 2021. – Vol. 22, no. 1. – P. 59–65. DOI: https://doi.org/10.15330/pcss.22.1.59-65.

Contacts

les@univ.kiev.ua; lesnak4@gmail.com; 066 9661650