Structural, mechanical and oxidation characteristics of siliconized Ti–Al–X (X=Nb, Ta) alloys

Popela, T.; Vojtěch, Dalibor; Vogt, Jean‐Bernard; Michalcová, Alena

doi:10.1016/j.apsusc.2014.04.076

Cited by 23 publications

(5 citation statements)

References 22 publications

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“…Furthermore, alloying elements that can lower the axial c/a ratio of TiAl close to unity may lead to an increase in the number of deformation modes, and consequently with improved ductility [4]. However, alloying with strong beta-stabilising elements such as (Cr, Nb, W and Mo) refine the grain structure and improve high temperature deformation ability as a result of stabilised metastable B2 phase (ordered phase of β at low temperature) [5,6]. However, small additions of silicon enhances high temperature oxidation resistance, in particular the fine coherent Ti 5 Si 3 particles formed during eutectoid reaction along lamellar interfaces intensifies creep resistance [7].…”

Section: Introductionmentioning

confidence: 99%

Structure-property orientation relationship of a γ/α2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

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Bolokang

Govender

et al. 2018

Journal of Alloys and Compounds

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Structure-property orientation relationship of a γ/α 2 /Ti 5 Si 3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy, Journal of Alloys and Compounds (2018), Abstract Structure-property relationship of the as-cast γ-Ti-45Al-2Nb-0.7Cr-0.3Si based intermetallic alloy was examined. The phases stable at room temperature in the alloy were γ/α 2 /Ti 5 Si 3 , respectively; while their crystal structures were described by means of chemical formulas, Pearson's number, space groups, lattice parameters, atomic positions and occupancy numbers using a Vienna ab initio simulation package (VASP) software for materials design. Moreover, high resolution electron backscatter diffraction (HSEBSD) was used to analyse the orientation relationship of both the ascast (β-solidifying) and heat-treated (α-solidifying) microstructural phases. The results showed that the formation of γ/α 2 /Ti 5 Si 3 follows the Blackburn orientation relationship (BOR): (β-solidifying) {110} β // {0001} α and <111> β // <2110> α , and for (α-solidifying) = (111)γ || (0001)α and <110]γ || <1120>α.

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Section: Introductionmentioning

confidence: 99%

Structure-property orientation relationship of a γ/α2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Mathabathe

Bolokang

Govender

et al. 2018

Journal of Alloys and Compounds

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“…In the work of Popela et al [ 78 ] samples of Ti-46.6Al, Ti-45.2Al-7.2Nb, and Ti-44.8Al-6.6Ta were examined, which were siliconized in a powder of silicon and subsequently heated at 900, 1000, and 1100 °C for 2 to 12 h [ 78 ]. The kinetics of silicide formation were observed.…”

Section: Properties Of Tial Alloys and Effect Of Silicon On Themmentioning

confidence: 99%

“…The kinetics of silicide formation were observed. The layer grew linearly with time at 900 °C; at 1000 and 1100 °C, the growth was suppressed after the first 2 h of siliconization [ 78 ]. The silicide layers formed at 900 and 1000 °C are composed of TiSi and TiSi 2 sublayers, TiSi crystals with an elongated shape, and at 1100 °C the structure consists of a Ti 5 Si 3 layer with an outer Al 2 O 3 layer.…”

Section: Properties Of Tial Alloys and Effect Of Silicon On Themmentioning

confidence: 99%

“…The silicide layers formed at 900 and 1000 °C are composed of TiSi and TiSi 2 sublayers, TiSi crystals with an elongated shape, and at 1100 °C the structure consists of a Ti 5 Si 3 layer with an outer Al 2 O 3 layer. Silicide layers have high hardness and improve oxidation resistance; in the case of ternary alloys the effect is even higher [ 78 ].…”

Section: Properties Of Tial Alloys and Effect Of Silicon On Themmentioning

confidence: 99%

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Development of TiAl–Si Alloys—A Review

et al. 2021

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This paper describes the effect of silicon on the manufacturing process, structure, phase composition, and selected properties of titanium aluminide alloys. The experimental generation of TiAl–Si alloys is composed of titanium aluminide (TiAl, Ti3Al or TiAl3) matrix reinforced by hard and heat-resistant titanium silicides (especially Ti5Si3). The alloys are characterized by wear resistance comparable with tool steels, high hardness, and very good resistance to oxidation at high temperatures (up to 1000 °C), but also low room-temperature ductility, as is typical also for other intermetallic materials. These alloys had been successfully prepared by the means of powder metallurgical routes and melting metallurgy methods.

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“…Chinese institutes had successfully prepared high-temperature alloy TiAl-3Ta-X(Cr, W), and successfully enhanced the high-temperature oxidation resistance. The research results showed that the alloy formed a square AlTaO4 phase during the oxidation processes, which efficiently prevented spreading O from the surface to the interior, thus inhibiting the oxidation of the alloy [14] .…”

Section: Introductionmentioning

confidence: 99%

Effects of plasma surface Ta alloying on the tribology behavior of γ-TiAl

Wei

Zhou

et al. 2021

J min metall B Metall

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To improve the wear resistance of ?-TiAl alloy, Ta alloy layer was prepared on surface by double glow plasma surface alloying technique. The tribology behavior of Ta alloy layer against Si3N4 at 25?, 350? and 500? were comparatively studied. The results showed that Ta alloy layer comprised a deposition layer and a diffusion layer. The deposition layer played a role in protection as a soft film. With the increase of temperature, the wear mechanism of ?-TiAl changed from abrasive wear to coexistence of abrasive wear and oxidation wear. Ta alloy layer?s wear mechanism changed from adhesive wear to coexistence of adhesive wear and oxidation wear. Surface Ta alloying process significantly reduced the wear volume, the specific wear rate and the friction coefficient of ?-TiAl and improved the wear resistance properties of ?-TiAl.

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Structural, mechanical and oxidation characteristics of siliconized Ti–Al–X (X=Nb, Ta) alloys

Cited by 23 publications

References 22 publications

Structure-property orientation relationship of a γ/α2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Structure-property orientation relationship of a γ/α2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Development of TiAl–Si Alloys—A Review

Effects of plasma surface Ta alloying on the tribology behavior of γ-TiAl

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