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Mechanical Alloying of Ni3Al with Molybdenum and Arrangement of Mo Atoms in Sublattices of the Intermetallicстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Дата последнего поиска статьи во внешних источниках: 20 мая 2014 г.
- Авторы: Portnoi V.K., Leonov A.V., Bogdanov V.I., Popov V.A., Streletskii A.N., Logacheva A.I.
- Журнал: The Physics of Metals and Metallography
- Том: 115
- Номер: 1
- Год издания: 2014
- Первая страница: 46
- Последняя страница: 52
- DOI: 10.1134/S0031918X14010116
- Аннотация: Mechanochemical synthesis (MS) of Ni70Al25Mo5 (composition 1) and Ni75Al20Mo5 (composi tion 2) mixtures, in which 5 at % Mo substitutes for the equal amount of Ni or Al, leads to the formation of Nibased nanocrystalline (coherent domains are ~7–12 nm in size) solid solutions; in this case, some amount of molybdenum remains free. A comparison of the lattice parameters of solid solutions, which were deter mined experimentally, with the magnitudes determined theoretically using Vegard law and Bozollo–Ferrante simulation, which takes into account volume modules of elasticity of elements, showed an increase in inter actions between atoms composed the solid solution and the formation of regions characterized by shortrange order. The heating of mechanically synthesized threecomponent Ni(Al, Mo) solid solutions to 720°C in a calorimeter chamber forms the ordered γ' phase (L12) at T ~ 450°C. An analysis of the ratio of relative inten sities of superlattice and fundamental reflections showed that, whatever the composition of initial mixture, Mo atoms always occupy positions in the Al sublattice. This arrangement of Mo atoms was confirmed by cal culations of coefficients of concentrational variations of the lattice parameters. When molybdenum is added to Ni3Al, Mo atoms, rather than Ni atoms, complete the Al sublattice. In this case, vacancies compensate for the lack of atoms in the Ni sublattice.
- Добавил в систему: Портной Валерий Кимович