Mechanical properties of HfB2.7 nanocrystalline thin films

Дуб, С. Н.; Goncharov, Alexander; Ponomarev, S. S.; Филиппов, В. Б.; Tolmacheva, G. N.; Agulov, A. V.

doi:10.3103/s1063457611030026

Cited by 25 publications

(12 citation statements)

References 12 publications

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“…In our opinion [24], the difference between the nanonardness magni tudes obtained by Vickers measurements and nanoin dentation (with a Berkovich indenter) is related to the fact that Vickers hardness measurements are per formed under static conditions, whereas the nano hardness measurements are performed under dynamic conditions. It should be noted the anomalously high elastic recovery magnitudes obtained for the films of titanium (82%) [3], tantalum (88%) [12], and hafnium (87%) [14,15] borides.…”

Section: Resultsmentioning

confidence: 95%

“…In the course of the formation of transition metal diboride films (TiB 2 , CrB 2 , TаB 2 , VB 2 , HfB 2 , etc. ), they were found to demonstrate a wide range of structural states, namely, from amorphous cluster to nanocrys talline with the growth texture in plane (00.1) plane and columnar structure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. A distinctive feature of the structure of transition metal diboride films with high physicomechanical characteristics is the columnar structure and growth texture in plane (00.1).…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the main factors that affect the formation of the structure, composition, and properties of film coatings are the deposition temperature and energy of film forming particles [17]. Highly textured overstoichio metric transition metal diboride films CrB 2 , HfB 2 , TaB 2 , and TiB 2 exhibit superhardness H V equal to 43.9 [7][8][9], 44 [6,14,15], 43.9 [12,13], and 48.5 [5] GPa compared to those equal to 33, 36, 35, and 37 GPa for stoichiometric compositions, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The H/E ratio for diamond is close to 0.1 and the elastic deformation during indentation is 100%. Thus, according to the H/E ratios (0.111 and 0.13) and elastic recovery (87 and 88%) [13,14], oversto ichiometric hafnium and tantalum diboride films sub stantially exceed all films and differ in the structure and approach diamond. The high mechanical proper ties of diamond are known to be achieved due to its electron structure with the formed sp 3 bonds.…”

Section: Introductionmentioning

confidence: 99%

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Superhardness effect in transition-metal diborides films

Бажин

Goncharov

Pogrebnyak

et al. 2016

Phys. Metals Metallogr.

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Abstract-The structure, composition, and properties of transition metal diboride films have been studied. It was shown that they are characterized by a wide range of structural states, namely from amorphous like to nanocrystalline with crystallite sizes of 1-50 nm. The characteristic peculiarity of the structure of film tran sition metal diborides with high physical and mechanical properties is the formation of a nanocrystalline (columnar) structure with the growth texture in plane [00.1] and a nanocrystallite size of 20-50 nm. The ele ment composition of a superhard highly textured film transition metal diborides was studied by ion mass spectrometry and Auger electron spectroscopy. The overstoichiometry effect in nanocrystalline transition metal diboride films is explained. It was shown that this effect is related to the formation of an additional B⎯B covalent bond, which is realized at subgrain boundaries and leads to the appearance of superhardness in the formed coatings.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Superhardness effect in transition-metal diborides films

Бажин

Goncharov

Pogrebnyak

et al. 2016

Phys. Metals Metallogr.

Self Cite

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“…Presently, a number of experimental studies exists dealing with the physical properties of HfB 2 , such as thermal and electrical properties [4][5][6][7], mechanical [8], and elastic properties [9].…”

Section: Introductionmentioning

confidence: 99%

Interaction between Electron and Phonon Subsystems in Hafnium Diboride

Sichkar¹

2016

Metallofiz. Noveishie Tekhnol.

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Ab initio calculation of the electron-phonon coupling functions is carried out, using full potential LMTO method. Low value of the averaged electronphonon interaction constant for HfB 2   0.17 indicates that there is no evidence of superconductivity in this compound. Electrical resistivity and anisotropy factor  z / x  1.079 (T  300 K) are theoretically calculated. A good agreement with experimental data of electrical resistivity is achieved. Comparative analysis of ABINIT, SIESTA, VASP, and present LMTO method for phonon spectra calculating is performed.Ab initio розрахунок функцій електрон-фононного зв'язку виконано за методом ЛМТО з використанням повного потенціалу. Низьке значення усередненої константи електрон-фононної взаємодії для HfB 2   0,17 сві-дчить, що немає підстав для виникнення надпровідного стану в цій спо-луці. Вперше було розраховано електричний опір і коефіцієнт анізотропії  z / x  1,079 (Т  300 К) для дибориду гафнію. Було досягнуто добру узго-дженість з експериментальними даними для електричного опору. У робо-ті виконано порівняльний аналіз результатів розрахунків фононних спе-ктрів методами ABINIT, SIESTA, VASP та запропонованим методом ЛМТО з детальним обговоренням одержаних відмінностей.Ab initio расчёт функций электрон-фононной связи выполнен в рамках метода ЛМТО с использованием полного потенциала. Низкое значение усреднённой константы электрон-фононного взаимодействия для HfB 2   0,17 свидетельствует, что нет оснований для возникновения сверхпро-водящего состояния в этом соединении. Впервые были рассчитаны элек-трическое сопротивление и коэффициент анизотропии  z / x  1,079 (Т  300 К) для диборида гафния. Было достигнуто хорошее согласие с экспериментальными данными для электрического сопротивления. В ра-боте выполнен сравнительный анализ результатов расчётов фононных спектров методами ABINIT, Siesta, VASP и предложенным методом ЛМТО с детальным обсуждением полученных различий.

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Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

et al. 2019

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Ultra‐high temperature ceramics (UHTCs) represent an emerging class of materials capable of providing mechanical stability and heat dissipation upon operation in extreme environments, e.g., extreme heat fluxes, chemically reactive plasma conditions. In the last few decades, remarkable research efforts and progress were done concerning the physical properties of UHTCs as well as their processing. Moreover, there are vivid research activities related to developing synthetic access pathways to UHTCs and related materials with high purity, tunable composition, nano‐scaled morphology, or improved sinterability. Among them, synthesis methods considering preceramic polymers as suitable precursors to UHTCs have received increased attention in the last few years. As these synthesis techniques allow the processing of UHTCs from the liquid phase, they are highly interesting, e.g., for the fabrication of ultra‐high temperature ceramic composites (UHT CMCs), additive manufacturing of UHTCs, etc. In the present review, UHTCs are in particular discussed within the context of their physical properties as well as energetics. Moreover, various synthesis methods using preceramic polymers to access UHTCs and related materials (i.e., (nano)composites thereof with silica former phases) are summarized and critically evaluated.

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Mechanical properties of HfB2.7 nanocrystalline thin films

Cited by 25 publications

References 12 publications

Superhardness effect in transition-metal diborides films

Superhardness effect in transition-metal diborides films

Interaction between Electron and Phonon Subsystems in Hafnium Diboride

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

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