Reactions in the crystallization of Ti-Ni-SC system alloys in the TiNi - Ni - ScNi region

Semenova, O.; Rusets'ka, N. Yu.; Velikanova, Т. Ya.; Верещак, В. М.

doi:10.1007/bf01329237

Cited by 3 publications

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“…The Sc-Ni-Ti ternary system has been investigated by Semenova and Velikanova using PXRD, EPMA and DSC. [110][111][112] It has been reported that the ternary system can be triangulated along the quasi-binary section The ternary Rh-Ru-Sc system has been investigated in detail by Kornienko and co-authors using PXRD, EMPA and DSC techniques. 113 No ternary compounds were found.…”

Section: Scniti Rhscti and Rhruscmentioning

confidence: 99%

“…The Sc-Ni-Ti ternary system has been investigated by Semenova and Velikanova using powder X-Ray diffraction (PXRD), Electron Probe Micro-Analysis (EPMA), and differential scanning calorimetry (DSC). [110][111][112] It has been reported that the ternary system can be triangulated along the quasi-binary section TiNi−Sc 0. The ternary Rh−Ru−Sc system has been investigated in detail by Kornienko et al 113 using PXRD, EMPA and DSC techniques.…”

Section: Sc−ni−ti Rh−sc−ti and Rh−ru−scmentioning

confidence: 99%

“…The Sc–Ni–Ti ternary system has been investigated by Semenova and Velikanova using powder X-Ray diffraction (PXRD), Electron Probe Micro-Analysis (EPMA), and differential scanning calorimetry (DSC). 110–112…”

Section: Scandium Ternary Systemsmentioning

confidence: 99%

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The scandium effect in multicomponent alloys

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Despite its excellent elemental properties, lightweight nature and good alloying potential, scandium has received relatively little attention in the manufacturing community. The abundance of scandium in the Earth's crust is quite high. It is more abundant than silver, cobalt, lead and tin. But, because scandium is so well dispersed in the lithosphere, it is notoriously difficult to extract in commercial quantities-hence low market availability and high cost. Scandium metallurgy is still a largely unexplored field-but progress is being made. This review aims to summarise advances in scandium metallurgical research over the last decade. The use of scandium as a conventional minor addition to alloys, largely in structural applications, is described. Also, more futuristic functional applications are discussed where details of crystal structures and peculiar symmetries are often of major importance. This review also includes data obtained from more obscure sources (especially Russian publications) which are much less accessible to the wider community. It is clear that more fundamental research is required to elevate the status of scandium from a laboratorybased curiosity to a mainstream alloying element. This is largely uncharted territory. There is much to be discovered.

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Section: Scniti Rhscti and Rhruscmentioning

confidence: 99%

Section: Sc−ni−ti Rh−sc−ti and Rh−ru−scmentioning

confidence: 99%

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The scandium effect in multicomponent alloys

Riva

Yusenko

Lavery

et al. 2016

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Phase Equilibria in the Ni - Sc - Ti System in the Region TiNi - Ni - Sc1.13Ni At 900°C

Semenova

Petyukh

2005

Powder Metall Met Ceram

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669.017.3.295N24N793N Physicochemical analysis methods have been applied to TiNi − Ni − Sc 1.13 Ni alloys at 900°C. It is shown that the phase interactions under these conditions are unaltered by comparison with those at subsolidus temperatures. The phase based on TiNi 3 , which is the most thermally and thermodynamically stable, is in equilibrium with all the other phases in the TiNi − Ni − Sc 1.13 Ni subsystem. The solubilities of the components in the phases based on Ti 50−x NiSc x , TiNi 3 , and the Laves phase are reduced at 900°C. The temperature of the polymorphic transformation in the phase based on ScNi 5 is raised by the dissolution of titanium in it to 930°C. An isothermal section is constructed of the phase diagram for the TiNi − Ni − Sc 1.13 Ni subsystem together with two polysections.Phase equilibria have been examined [1,2] in the Ni − Sc − Ti system in the TiNi − Ni − Sc 1.13 Ni region on the crystallization of alloys and at subsolidus temperatures. This paper continues the results on Ni − Sc − Ti alloys and represents the alloy structure at 900°C.Interest in alloys in the Ti − Ni system is related to their phase diagram, which has been subject to repeated transformation and refinement. To derive an optimized description of the phases in the Ti − Ni system [3], we have used data not previously available and which were not employed in discussing the results in [1, 2], from which we have considered the thermodynamic evaluation of the phase equilibria in this system and the description of the nonstoichiometry of phases based on TiNi and TiNi 3 . In accordance with [3], the phase based on TiNi 3 and considered to be a linear has a region of homogeneity on the nickel side: 5 at.% at subsolidus temperature and 2 at.% at 900°C. The other elements in the phase equilibria characterizing the Ti − Ni system behave in accordance with the model given in [4]. The solubility of nickel in TiNi at 900°C is close to 3 at.%; that of titanium in nickel is close to 11 at.%; and that of nickel in titanium is close to 10 at.%.The homogeneity regions of all the phases in the Sc − Ni system, with the exception of the Laves phase ScNi 2 , are less than 1 at.%. The homogeneity region at 900°C is in the interval 28-34 at.% Sc [5]. The binary phase based on ScNi 5 undergoes a polymorphic transformation at 880 ± 20°C [6, 7]. Its high-temperature modification has a hexagonal crystal structure of CaCu 5 type, while the structure of the low-temperature phase has not been established. The phase diagram for the Ni − Sc − Ti system can be triangulated along the section between the equiatomic phases in the binary systems Ni − Ti and Ni − Sc [1,2,8]. At 900°C, the NiTi − Sc 1.13 Ni section is quasibinary.See [1, 2, 8] on the purity of the initial components, the preparation conditions, and the methods of examining the Ni − Sc − Ti alloys. After homogenization at subsolidus temperatures [2], the Ni − Sc − Ti alloys were annealed at 900°C for 50 h in an oven filled with argon. This gave the isothermal section at 900°C for the Ni − Sc − ...

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Phase Equilibria in the Melting - Crystallization Region for Alloys in the Ti - TiNi - Sc0.53Ni0.47 - Sc Subsystem

Velikanova

Krendelsberger

Semenova

2005

Powder Metall Met Ceram

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669.017.324′295′793′ Physicochemical analysis methods have been applied to the phase equilibria in the Ti − TiNi − Sc 0.53 Ni 0.47 − Sc subsystem of the Ti − Ni − Sc ternary system. No ternary compounds are found in the subsystem. Isomorphous phases based on Ti 2 Ni and Sc 0.72 Ni 0.28 form continuous series of solid solutions (η) at subsolidus temperatures, as do the equiatomic compounds TiNi and Sc 0.53 Ni 0.47 . The crystallization of the η phase in the ternary system is incongruent, as in the binary systems Ti − Ni and Sc − Ni. The solidus surface for the Ti − TiNi − Sc 0.53 Ni 0.47 − Sc subsystem has a nonvariant four-phase reaction of transition type at 830EC. The compositions of the alloys that take part in it extend to the Sc − Ni side.

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Reactions in the crystallization of Ti-Ni-SC system alloys in the TiNi - Ni - ScNi region

Cited by 3 publications

References 0 publications

The scandium effect in multicomponent alloys

The scandium effect in multicomponent alloys

Phase Equilibria in the Ni - Sc - Ti System in the Region TiNi - Ni - Sc1.13Ni At 900°C

Phase Equilibria in the Melting - Crystallization Region for Alloys in the Ti - TiNi - Sc0.53Ni0.47 - Sc Subsystem

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