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Search Results (4)

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Keywords = titanium aluminides and silicides

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18 pages, 7120 KB  
Article
Fe–Al–Si-Type Iron Aluminides: On the Strengthening by Refractory Metals Borides
by Věra Vodičková, Martin Švec, Pavel Hanus, Šárka Bukovská and Petra Pazourková Prokopčáková
Materials 2022, 15(20), 7189; https://doi.org/10.3390/ma15207189 - 15 Oct 2022
Cited by 6 | Viewed by 2204
Abstract
The effect of boron addition into Fe–28Al–5Si–X (X = -, 2Mo, or 2Ti) on the structure and high-temperature yield stress was investigated. Generally, the alloying of binary Fe3Al-type iron aluminides by silicon significantly improves high-temperature mechanical properties by solid-solution strengthening. On [...] Read more.
The effect of boron addition into Fe–28Al–5Si–X (X = -, 2Mo, or 2Ti) on the structure and high-temperature yield stress was investigated. Generally, the alloying of binary Fe3Al-type iron aluminides by silicon significantly improves high-temperature mechanical properties by solid-solution strengthening. On the other hand, the workability and ductile properties at room or slightly elevated temperatures get worse with the increasing silicon content. Boron alloying together with titanium or molybdenum alloying is one of the ways to improve the workability of this type of alloy and, at the same time, ensure the formation of a sufficient amount of secondary phase particles required for effective strengthening. In this paper, the influence of 1 at. % of boron on high-temperature yield stress is evaluated in response to structural changes and compared with results obtained previously on the same type of alloy (Fe–28Al–5Si–2X, X= -, Mo, or Ti) but without boron alloying. It can be concluded that the network structure of borides of refractory metals formed due to boron alloying works more effectively for alloy hardening at higher temperatures than a mixture of silicides and carbides present in the boron-free alloy of the same composition. Full article
(This article belongs to the Special Issue Application, Processing, and Testing of New Progressive Materials)
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21 pages, 6293 KB  
Review
Development of TiAl–Si Alloys—A Review
by Anna Knaislová, Pavel Novák, Marcello Cabibbo, Lucyna Jaworska and Dalibor Vojtěch
Materials 2021, 14(4), 1030; https://doi.org/10.3390/ma14041030 - 22 Feb 2021
Cited by 40 | Viewed by 6717
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Materials under Extreme Conditions: Technologies for CRMs Reduction, Substitution and Recovery)
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8 pages, 1847 KB  
Article
Effect of Irradiation with Si+ Ions on Phase Transformations in Ti–Al System during Thermal Annealing
by Zhuldyz Sagdoldina, Bauyrzhan Rakhadilov, Sherzod Kurbanbekov, Rauan Kozhanova and Aidar Kengesbekov
Coatings 2021, 11(2), 205; https://doi.org/10.3390/coatings11020205 - 10 Feb 2021
Cited by 11 | Viewed by 3032
Abstract
The article deals with the effect of irradiation with Si+ ions on phase transformations in the Ti–Al system during thermal annealing. An aluminum film with a thickness of 500 nm was deposited on VT1-00 titanium samples by magnetron sputtering, followed by ion implantation. [...] Read more.
The article deals with the effect of irradiation with Si+ ions on phase transformations in the Ti–Al system during thermal annealing. An aluminum film with a thickness of 500 nm was deposited on VT1-00 titanium samples by magnetron sputtering, followed by ion implantation. Samples before and after irradiation with Si ions were annealed in a vacuum of 10−4 Pa in the temperature range 600–1000 °C. It was established that ion implantation reduces the dissolution of Al in α-Ti with the formation of titanium silicides (TiSi2, Ti5Si3) and stabilizes aluminide phases Ti3Al rich in aluminum. As a result, a composite structure based on titanium silicide/aluminide was obtained on the surface of the sample synthesized by complex treatment: deposition, irradiation with Si+, and thermal annealing at the near-surface layers. The formation of the phase-structural state of the implanted layers is associated with the displacement of atoms of the crystal lattice, a result that is reflected in an increase in the size of the crystal lattice and a decrease in microdistortion of the lattice. The opposite effect is observed with increasing temperature. This fact is explained by the relaxation of unstable large grains with an excess of internal energies. At the annealing temperature of 900–1000 °C, a significant increase in microhardness was observed due to silicide phases. Full article
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19 pages, 18688 KB  
Article
Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods
by Anna Knaislová, Pavel Novák, Jaromír Kopeček and Filip Průša
Materials 2019, 12(19), 3084; https://doi.org/10.3390/ma12193084 - 21 Sep 2019
Cited by 20 | Viewed by 4711
Abstract
Melting metallurgy is still the most frequently used and simplest method for the processing of metallic materials. Some of the materials (especially intermetallics) are very difficult to prepare by this method due to the high melting points, poor fluidity, or formation of cracks [...] Read more.
Melting metallurgy is still the most frequently used and simplest method for the processing of metallic materials. Some of the materials (especially intermetallics) are very difficult to prepare by this method due to the high melting points, poor fluidity, or formation of cracks and pores after casting. This article describes the processing of Ti-Al-Si alloys by arc melting, and shows the microstructure, phase composition, hardness, fracture toughness, and compression tests of these alloys. These results are compared with the same alloys prepared by powder metallurgy by the means of a combination of mechanical alloying and spark plasma sintering. Ti-Al-Si alloys processed by melting metallurgy are characterized by a very coarse structure with central porosity. The phase composition is formed by titanium aluminides and titanium silicides, which are full of cracks. Ti-Al-Si alloys processed by the powder metallurgy route have a relatively homogeneous fine-grained structure with higher hardness. However, these alloys are very brittle. On the other hand, the fracture toughness of arc-melted samples is immeasurable using Palmqvist’s method because the crack is stopped by a large area of titanium aluminide matrix. Full article
(This article belongs to the Collection Advanced Powder Metallurgy Technologies)
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