The crystal-geometric factors in Laves phases

Klopotov, A. A.; Потекаев, А. И.; Perepelkin, Mikhail A.; Solonitsina, N. O.; Klopotov, Vladimir D.; Kozlov, E. V.

doi:10.22226/2410-3535-2011-2-117-122

Cited by 3 publications

(8 citation statements)

References 3 publications

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“…Data for the calculation are taken from [19] Deviation from Zena law and the packing factor in the alloys of Pd− − − −Me (Me = Co, Rh, Ir, Ni, Pt, Cu, Ag, Au) systems A specific set of crystal geometric parameters is used as a standard method of searching general patterns of stability of structural compounds in binary and multicomponent systems. Such as the size factor δ=R В /R А (where R А and R В − radius of atoms of type A and B in the binary alloys) [12,21], the deviation value from the linear dependence of the atomic volume ∆Ω/Ω ЭXP =(Ω ЭXP −Ω З )/Ω ЭXP from concentration (Zena law [12,20,21]), etc. Ω ЭXP is an atomic volume per atom in the unit cell, determined from the experimental data and based on the calculation of atomic diameters (they are obtained from the shortest distances between the atoms in the structures).…”

Section: Structure and Properties Of Metals At Different Energy Effec...mentioning

confidence: 99%

Alloys Based on Crystallochemical and Geometric Parameters of Palladium Crystal Structure

Морозов¹,

Potekaev

Klopotov

et al. 2014

AMR

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The results of the analysis of phase equilibria ordered phases in binary systems based on palladium Pd-Me (Me = Co, Rh, Ir, Cu, Ag, Au, Ni, Pt) are set out to search for correlations and crystal-chemical and crystal geometric factors. It is found that the packing factor in disordered solid solutions in binary systems based on Pd is close to the value of 0.74 on a background of a slight deviation from the atomic volumes Xena. It is revealed that increasing of the hydrogen permeability in Cu-Pd binary alloys correlates with significant reduction of the packing factor in B2 ordered phase in the range of 40 at.% Pd. It is found that various structural-phase states are formed in Pd-Me binary systems with certain combinations of temperature and size factors.

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Section: Structure and Properties Of Metals At Different Energy Effec...mentioning

confidence: 99%

Alloys Based on Crystallochemical and Geometric Parameters of Palladium Crystal Structure

Морозов¹,

Potekaev

Klopotov

et al. 2014

AMR

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“…Диаграмма состояния «Ti-Al» [1] Алюминид титана Ti 3 Al (a 2 -фаза), как и α-Ti, имеет гексагональную решетку, однако в отличие от альфа-титана характеризуется упорядоченным расположением атомов титана и алюминия. Это соединение относится к пространственной группе симметрии P6 3 /mmc, структурному типу D0 19 [3,4]. Интерметаллид TiAl (g-фаза) обладает упорядоченной тетрагонально искаженной гранецентрированной структурой, относится к пространственной группе P4/mmm и структурному типу L1 0 [4][5][6].…”

Section: Introductionunclassified

“…Кроме этих двух типов алюминидов в литературе отмечаются соединения, особенностью которых служат узкие области гомогенности -TiAl 2 , TiAl 3 . Зафиксированные экспериментально интерметаллиды типа Ti 5 Al 3 , Ti 5 Al 11 , Ti 9 Al 23 являются метастабильными [4]. Возможности образования множества фаз, в том числе неустойчивых, существенно осложняют анализ системы Ti-Al.…”

Section: Introductionunclassified

“…По данным специалистов алюминиды титана могут быть конкурентоспособными по сравнению с жаропрочными сплавами, предназначенными для эксплуатации при температурах 600…800 °С [7]. Интерметаллические соединения на основе сплавов Ti-Al относят к материалам нового поколения -суперсплавам [4,8].…”

Section: Introductionunclassified

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Surface alloying of titanium with aluminium by non-vacuum electron beam cladding of powder mixtures

Батаев¹,

Lazurenko²,

Golkovski³

et al. 2017

Metal Working and Material Science

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Методом вневакуумной электронно-лучевой наплавки порошковых смесей, содержащих алюминий, на плоских заготовках из технически чистого титана сформированы поверхностные слои, упрочненные интерметаллидами. Исследованы структура, микротвердость и триботехнические свойства поверхностно легированных материалов. Максимальный уровень микротвердости наплавленных покрытий составляет ~600 HV. Причины повышения твердости материалов обусловлены формированием алюминидов титана и проявлением механизма твердорастворного упрочнения титана. По сравнению с титаном ВТ1-0 полученные материалы характеризуются более низкими значениями коэффициента трения и меньшей склонностью к схватыванию при взаимодействии со стальным индентором. При испытаниях на трение о закрепленные частицы абразива значения относительной износостойкости тесно коррелируют с микротвердостью наплавленных материалов.

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“…The widespread introduction of shape memory alloys in engineering is limited both by financial reasons, and by the fact that it's difficult to describe their functional and mechanical behavior [4]. The economic feasibility of these alloys in engineering can be achieved both by expanding the range of materials and by the use of multi-componebt shape memory alloys [5,6], and by the surface modification (SM) with SME materials [7].…”

Section: Introductionmentioning

confidence: 99%

Hardware-Technological Features of Layered Surface Composition Made of Shape Memory Materials in a Single Vacuum Cycle

Rusinov¹,

Blednova²

2016

KEM

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In this article we explained why it is reasonable to create a layered surface composition using multicomponent materials with shape memory effect (SME) to improve reliability, durability and extend the life cycle of mechanical engineering products. We developed and patented hardware and technological solutions in order to test the composition formation technology. These solutions help us to form the layers made of shape memory materials, which have gradient distribution of properties and capabilities in a single vacuum cycle. We demonstrated ample opportunities of complex surface composition method with shape memory materials, including mechanical activation, high-velocity oxygen-fuel spraying (HVOF), thermal and thermomechanical processing. This allows us to create nanostate and maintain functional and mechanical properties of shape memory materials. As an example, we demonstrated the results of statistical simulation of HVOF technology by shape memory material Ti51Ni44Cu5, that was made by means of algorithmic planning and allowed us to optimize treatment modes according to the following criteria: adhesive strength, porosity and nanostructured state.

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The crystal-geometric factors in Laves phases

Cited by 3 publications

References 3 publications

Alloys Based on Crystallochemical and Geometric Parameters of Palladium Crystal Structure

Alloys Based on Crystallochemical and Geometric Parameters of Palladium Crystal Structure

Surface alloying of titanium with aluminium by non-vacuum electron beam cladding of powder mixtures

Hardware-Technological Features of Layered Surface Composition Made of Shape Memory Materials in a Single Vacuum Cycle

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