Regularities and Mechanism of Formation of Aluminides in the TiH2-ZrH2-Al System

Muradyan, G.N.; Dolukhanyan, S. K.; Aleksanyan, A. G.; Ter-Galstyan, O. P.; Mnatsakanyan, N. L.

doi:10.1134/s199079311901010x

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…[52,58] B2 ordering was also reported for Al-rich b(Ti,Zr) synthesised from hydrides at 1000°C. [59] Contrary to these observations, Ti 2 AlZr with D0 19 structure was also observed after annealing an arcmelted button of the stoichiometric composition at 1000°C for 720 h. [51] This is in agreement with ab initio calculations, which predicted that Ti 2 AlZr will have the D0 19 structure. [53,60,61] However, quenching or deformation of Ti-rich compositions of b(Ti,Zr) may lead to formation the hexagonal x phase and orthorhombic a 00 and hexagonal a 0 martensite [52,53,56,58] like in many other Ti-based alloys, e.g.…”

Section: Phasesmentioning

confidence: 62%

“…A small phase field for Zr 3 Al and respective tentative multi-phase equilibria have been added to comply with the accepted Al-Zr binary system. As it has not been settled yet, whether the compositions Ti 2 AlZr and Zr 2 TiAl are separate phases, or indicate B2-ordering at this temperature within Al-rich compositions of b(Ti,Zr), [52,57,59] an area where B2ordering may occur has been outlined in Fig. 2.…”

Section: Phasesmentioning

confidence: 99%

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Critical Assessment of the Al-Ti-Zr System

Kahrobaee

Palm

2020

J. Phase Equilib. Diffus.

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Only within the last couple of years, complete isothermal sections for the Al-Ti-Zr system have been determined. Up to then there had been several investigations, but these were limited to the Ti-Zr and Ti-Al sides and the Ti- and Al corners of the system. Also recently the system has been evaluated by thermodynamic ab initio calculations and CALPHAD-type (CALculation of PHAse Diagrams) modelling. As Al-Ti-Zr alloys are of interest for a variety of applications and as the last assessment has been performed more than 15 years ago, this new critical evaluation of the existing literature about phase equilibria in the Al-Ti-Zr system has been performed.

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Section: Phasesmentioning

confidence: 62%

Section: Phasesmentioning

confidence: 99%

Critical Assessment of the Al-Ti-Zr System

Kahrobaee

Palm

2020

J. Phase Equilib. Diffus.

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“…X-ray diffraction patterns of original and irradiated sample surfaces treated at temperatures of 1600 • C and 1700 • C are shown in Figure 10. [55,56]. Shown below are reactions for powders of the Al 2 O 3 -Y 2 O 3 system synthesized using the nanospray drying method [57]:…”

Section: The Elemental Composition Measured At Different Areas Inmentioning

confidence: 99%

“…Ceramics 2023, 6, FOR PEER REVIEW 13 result of interaction of Y4Al2O9 and Al2O3. As the temperature increases further to 1700 °C, it is likely to form the Y3Al5O12 (Ia-3d (230)) phase of the yttrium-aluminum garnet as a result of reaction between YAlO3 and Al2O3 [55,56]. Shown below are reactions for powders of the Al2O3-Y2O3 system synthesized using the nanospray drying method [57]: Thus, as the processing temperature increases, yttrium oxide first embeds in the grain boundaries as they are formed, and then rises to the surface to form an aluminum-yttrium structure, which may affect the strength and thermal properties.…”

Section: The Elemental Composition Measured At Different Areas Inmentioning

confidence: 99%

Electron-Beam Processing of Aluminum-Containing Ceramics in the Forevacuum Pressure Range

Klimov,

Bakeev,

Zenin

2023

Ceramics

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Aluminum–ceramic materials based on Al2O3 and AlN are widely used in the electronics industry and, according to a number of electrophysical and technical and economic parameters, are among the most suitable for the production of electrical and radio engineering products. In this study, it is shown that the treatment of ceramics based on Al2O3 with an electron beam with a power of 200–1100 W and a current of 10–50 mA leads to heating of the ceramic surface to a temperature of 1700 °C. When heated to a temperature of 1500 °C and kept at this temperature for no more than 10 s, an increase in the roughness of the ceramic surface is observed by more than an order of magnitude. At the same time, for ceramic substrates based on aluminum nitride, an increase in the temperature of electron beam treatment from 1300 to 1700 °C leads to an increase in thermal conductivity from 1.5 to 2 times. The edge angle of water wetting of the AlN surface can vary from 20 to 100 degrees depending on the processing temperature, which allows one to control the transition of the material from a hydrophilic to a hydrophobic state. At the same time, electron beam exposure to Al2O3 does not change the wettability of this material so much. Electron beam processing in the forevacuum pressure region allows controlled changes in the electrophysical properties of ceramic materials based on Al2O3 and AlN.

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“…% adopted for additive manufacturing (AM)) [8]. Additionally, Zr is a β-stabilizing alloying element in Ti-alloys [9], and in Ti-Al alloys containing higher amounts of Zr, B2-ordered β 0 has been observed [10][11][12][13]. Although the composition and temperature range where β 0 exists has not been established, the ductility of TiAl-based alloys deteriorates if β 0 transforms to the brittle hexagonal ω 0 -phase at lower temperatures [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Phase Equilibria in the Ti—Al—Zr System at 1000–1300 °C

et al. 2022

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Four partial isothermal sections of the Ti—Al—Zr system up to 60 at. % Al and 30 at. % Zr were experimentally established between 1000–1300 °C. Six heat-treated alloys were analysed by scanning electron microscopy, transmission electron microscopy, electron probe microanalysis, conventional and high-energy X-ray diffraction, and differential thermal analysis. Phase equilibria were determined between B2-ordered (β0), βTi,Zr, αTi, Ti3Al, TiAl, and ZrAl2.

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Regularities and Mechanism of Formation of Aluminides in the TiH2-ZrH2-Al System

Cited by 9 publications

References 17 publications

Critical Assessment of the Al-Ti-Zr System

Critical Assessment of the Al-Ti-Zr System

Electron-Beam Processing of Aluminum-Containing Ceramics in the Forevacuum Pressure Range

Experimental Investigation of Phase Equilibria in the Ti—Al—Zr System at 1000–1300 °C

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