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Title | Nanostructured multielement (TiHfZrNbVTa)N coatings before and after implantation of N+ ions (1018 cm 2 ): Their structure and mechanical properties |
Authors |
Pohrebniak, Oleksandr Dmytrovych
Bondar, Oleksandr Viacheslavovych Borba, S.O. Abadias, G. Konarski, P. Plotnikov, S.V. Beresnev, V.M. Kassenova, L.G. Drodziel, P. |
ORCID |
http://orcid.org/0000-0002-9218-6492 http://orcid.org/0000-0003-3174-0709 |
Keywords |
Multielement coatings N+ implantation Microstructure Nanohardness Elasticity modulus |
Type | Article |
Date of Issue | 2016 |
URI | http://essuir.sumdu.edu.ua/handle/123456789/46986 |
Publisher | Elsevier |
License | |
Citation | Nanostructured multielement (TiHfZrNbVTa)N coatings before and after implantation of N+ ions (1018 cm 2 ): Their structure and mechanical properties [Текст] / A.D. Pogrebnjak, O.V. Bondar, S.O. Borba [та ін.] //Nuclear Instruments and Methods in Physics Research B. — 2016. — №385. — С. 74-83. |
Abstract |
Multielement high entropy alloy (HEA) nitride (TiHfZrNbVTa)N coatings were deposited by vacuum arc
and their structural and mechanical stability after implantation of high doses of N+ ions, 1018 cm 2
, were investigated. The crystal structure and phase composition were characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy, while depth-resolved nanoindentation tests were used to
determine the evolution of hardness and elastic modulus along the implantation depth. XRD patterns
show that coatings exhibit a main phase with fcc structure, which preferred orientation varies from
(1 1 1) to (2 0 0), depending on the deposition conditions. First-principles calculations reveal that the
presence of Nb atoms could favor the formation of solid solution with fcc structure in multielement
HEA nitride. TEM results showed that amorphous and nanostructured phases were formed in the implanted coating sub-surface layer (100 nm depth). Concentration of nitrogen reached 90 at% in the near-surface layer after implantation, and decreased at higher depth. Nanohardness of the as-deposited coatings varied from 27 to 38 GPa depending on the deposition conditions. Ion implantation led to a significant decrease of the nanohardness to 12 GPa in the implanted region, while it reaches 24 GPa at larger depths. However, the H/E ratio is P0.1 in the sub-surface layer due to N+ implantation, which is expected to have beneficial effect on the wear properties. |
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File | Size | Format | Downloads |
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Nanostructured multielement_Pogrebnjak.pdf | 2.94 MB | Adobe PDF | 329443618 |
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