Microstructure and mechanical properties of cast in-situ TiAl matrix composites reinforced with (Ti,Nb)2AlC particles

Lapin, J.; Klimová, A.; Gabalcová, Zuzana; Pelachová, T.; Bajana, Oto; Štamborská, Michaela

doi:10.1016/j.matdes.2017.08.012

Cited by 51 publications

(50 citation statements)

References 51 publications

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“…7. Similar solidification path, formation of peritectic α phase and solid phase transformations were recently described by Klimová et al [34,35]. size of these particles and results of the measurements might be influenced by the surrounding matrix.…”

Section: Microstructuresupporting

confidence: 74%

“…The lowest carbon content of 460 wtppm is found in the 8Ta-Scast alloy, which corresponds to about 0.2 at.%. This amount of carbon is usually used in alloy design to improve hightemperature mechanical properties of TiAl-based alloys through solid solution and precipitation strengthening [4,28,[31][32][33][34][35]. However, the 8Nb-Scast and 8Ta--Y-Scast alloys contain up to 1020 wtppm of carbon.…”

Section: Chemical Compositionmentioning

confidence: 99%

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Preparation of TiAl-based alloys by induction melting in graphite crucibles

Čegan¹,

Szurman²,

Kursa³

et al. 2016

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Three TiAl-based alloys with nominal composition Ti-47Al-8Nb, Ti-47Al-8Ta and Ti-47Al--8Ta-0.3Y (at.%) were prepared by induction melting in graphite crucibles and centrifugal casting into graphite moulds. Chemical composition, microstructure and mechanical properties of the as-cast alloys are characterised. The melting in the graphite crucible leads to an increase of carbon content from 460 to 1020 wtppm and formation of fine carbide particles predominantly in the γ(TiAl) phase. Beside fine carbides, the addition of 0.3 at.% of yttrium results in formation of fine Y2O3 and YAl2 particles. The oxygen content depends on the chemical composition and varies between 330 and 780 wtppm for Ta and Nb containing alloys, respectively. The as-cast alloys exhibit relatively high values of room-temperature compression yield strength up to 922 MPa, ultimate compression strength up to 1793 MPa and plastic deformation to fracture up to 24.3 %. The compression yield strength increases linearly with increasing Vickers microhardness of the as-cast alloys. From the point of view of chemical composition, microstructure and studied mechanical properties, induction melting in the graphite crucible and centrifugal casting into graphite mould can be considered as a suitable method of preparation of TiAl-based alloys.K e y w o r d s :

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Section: Microstructuresupporting

confidence: 74%

Section: Chemical Compositionmentioning

confidence: 99%

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Čegan¹,

Szurman²,

Kursa³

et al. 2016

View full text Add to dashboard Cite

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“…However, roughing and growth of carbides at higher temperatures appears to be problematic because large carbides in TiAl-based alloys reduce ductility and deteriorate mechanical properties at RT [23,27]. Figure 13 shows the temperature dependence of compressive yield strength (YS) of the alloy after HT and ageing at 950…”

Section: Vickers Microhardness Evolution During Ageingmentioning

confidence: 99%

“…However, most of the carbon added alloys include both types of carbides [21][22][23]. The driving force for the precipitation process is the limited solubility of carbon, and as generally observed on other alloys, the shape, size and distribution of precipitates are the main factors determining the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The driving force for the precipitation process is the limited solubility of carbon, and as generally observed on other alloys, the shape, size and distribution of precipitates are the main factors determining the mechanical properties. In spite of the previous studies which dealt with precipitation of carbides in TiAl alloys [10,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], information about the microstructural stability of carbon added alloys at higher temperatures and longer times is still lacking in the literature. Therefore, this article aims to study the long-term microstructural stability of the Ti-45Al--5Nb-0.2B-0.75C (at.%) alloy and effect of microstructural changes on mechanical properties during longterm ageing at temperatures of 750, 850 and 950…”

Section: Introductionmentioning

confidence: 99%

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Thermal stability and precipitation strengthening of fully lamellar Ti-45Al-5Nb-0.2B-0.75C alloy

Čegan¹,

Szurman²

2018

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The alloy with a composition Ti-45Al-5Nb-0.2B-0.75C (at.%) was prepared by induction melting and centrifugal casting. The fully lamellar microstructure of the alloy without carbides was produced by heat treatment consisting of hot isostatic pressing (HIP) and solution annealing followed by cooling to room temperature. The stability of the fully lamellar γ(TiAl) + α2(Ti3Al) microstructure was studied at temperatures of 750, 850 and 950• C up to an ageing time of 3400 h. The microstructure analysis shows that the most dominant change in the microstructure was the α2 lamellae thinning, which was more pronounced at a higher ageing temperature and longer time. The formation of recrystallized γ grains and Ti2AlC carbides was observed during ageing at the temperatures of 850 and 950• C. The microstructural changes affected the microhardness at room temperature (RT) and compression yield strength at temperatures ranging from RT to 950K e y w o r d s : titanium aluminides, thermal stability, microstructure, carbides, yield strength

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Continuous Casting of TiAlNb Alloys with Different Velocities by Mixing Binary TiAl Ingot and Nb Wire

et al. 2017

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A method of continuous casting is used and the research investigates microstructure and mechanical properties under different drawing velocity (R, mm/min). The results show that microstructure and composition measurement of different zones are uniform. The smallest grain size is 25.93 mm and formability is good with 0.5R. Compressive strength is higher with 0.5R and maximum value is 1697MPa. Fracture toughness with 0.5R improves about 35.7% which is 21.7MPaÁm1/2. The fracture morphology is trans-lamellar fracture and interface de-lamination. The method is a feasible way to continuously cast the TiAl-Nb alloys. The R is an important parameter to add high-melting-point element, which affects solidified temperature interval of solidification front and electromagnetic stirring.1700058 (1 of 7)

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Microstructure and mechanical properties of cast in-situ TiAl matrix composites reinforced with (Ti,Nb)2AlC particles

Cited by 51 publications

References 51 publications

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Thermal stability and precipitation strengthening of fully lamellar Ti-45Al-5Nb-0.2B-0.75C alloy

Continuous Casting of TiAlNb Alloys with Different Velocities by Mixing Binary TiAl Ingot and Nb Wire

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