Superhardness effect in transition-metal diborides films
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 struc...
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| Veröffentlicht in: | Physics of metals and metallography 2016-06, Vol.117 (6), p.594-601 |
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| container_title | Physics of metals and metallography |
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| creator | Bazhin, A. I. Goncharov, A. A. Pogrebnyak, A. D. Stupak, V. A. Goncharova, S. A. |
| description | 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 transition-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 element 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 transitionmetal 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. |
| doi_str_mv | 10.1134/S0031918X16060028 |
| format | Article |
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| subjects | Chemistry and Materials Science Columnar structure Covalent bonds Crystallites Formations Materials Science Mechanical properties Metallic Materials Nanocrystals Strength and Plasticity Surface layer Texture |
| title | Superhardness effect in transition-metal diborides films |
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