Thermodynamic properties of Ti–Al intermetallics

Reddy, Ramana G.; Yahya, Amri; Brewer, Leo

doi:10.1016/s0925-8388(01)00972-0

Cited by 34 publications

(13 citation statements)

References 4 publications

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“…Eventually, several sublayers in the TiAl/Ti 3 Al component layer formed by periodic variation between rich-Al zone and rich-Ti zone along the depositing direction of TiAl/Ti 3 Al layer condensate resulted from element content fluctuation of melting pool and steam flow. Based on the thermodynamic calculation presented by Kattner et al, 17) TiAl 3 phase formed in initial stage of deposition, and along with the deposition process, non-stable TiAl 3 phase dissolved into TiAl phase and Ti 3 Al phase due to Ti diffusion into TiAl 3 phase.…”

Section: Microstructure and Phasementioning

confidence: 99%

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

Wang

2015

Mater. Trans.

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A 110 µm thick micro-laminate sheet comprising 14 layers of TiAl/Ti 3 Al two phase compound and 15 layers of Ti was prepared by electron beam physical vapor deposition (EB-PVD), and its microstructures and mechanical properties were characterized. Results show that the hardness of interfacial region is about 7.029 GPa, higher than that of either component layer. After densification, room-temperature tensile strength and elongation are improved compared to single Ti-Al compound sample, reaching 656.89 MPa and 2.92%, respectively. Its tensile curve presents a distinct jagged feature. High-temperature tensile strength exhibits an abnormal increase with temperature, exceeding 440 MPa at 1023 K. The presence of Ti layers will lead to cracks stagger along the inter-laminar interface or the crack deflection and the micro-bridge connection caused by Ti layers, due to the TiAl-Ti 3 Al/¡-Ti micro-laminate displaying a fine characteristic of delayed fracture.

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Section: Microstructure and Phasementioning

confidence: 99%

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

Wang

2015

Mater. Trans.

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“…Thermodynamic activities of Al in the composition range of Ti 3 Al were determined experimentally by Samokhval et al [44] and Reddy et al [45] (emf method with CaF 2 as solid electrolyte, about 820 to 1010 K), and by Eckert et al [46] (Knudsen cell-mass spectrometric method, about 1180 to 1430 K). In order to be able to compare the corresponding experimental data, an average temperature of 1123 K was chosen and all activity values were converted to this temperature.…”

Section: Derivation Of the Model For D0 19 Compounds And Application mentioning

confidence: 99%

A3B Intermetallics: Defect chemistry and nonstoichiometry

Ipser

2007

Pure and Applied Chemistry

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Abstract:The defect chemistry of different ordered intermetallic compounds with the A 3 B stoichiometry was investigated. Three groups were distinguished according to their crystal structure: L1 2 compounds (Ni 3 Al, Ni 3 Ga, Pt 3 Ga, Pt 3 In), D0 19 compounds (Ti 3 Al), and D0 3 compounds (Fe 3 Al, Ni 3 Sb). Statistical-thermodynamic models were derived based on a Wagner-Schottky approach, and the calculated activity curves (thermodynamic activity vs. composition) were compared with experimental activity data. In this way, we attempted to obtain at least estimated values for the energies of formation of the different types of point defects present in the corresponding compound, both as configurational defects (which are responsible for nonstoichiometry) and as thermal defects. In the majority of cases, thermodynamic activities had to be determined experimentally in the present study, using either an emf method with a solid electrolyte (Ni 3 Ga, Pt 3 Ga, Pt 3 In, Fe 3 Al) or a Knudsen cell-mass spectrometric method (Ni 3 Sb).

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“…Among the intermetallics, titanium aluminide intermetallic compounds have received considerable attention recently due to their exceptional properties, such as high yield strength at elevated temperatures, improved creep properties, high oxidation and corrosion resistance, low density and good dimensional stability [4][5][6][7]. However, the biggest problem with these materials is the lack of ductility at conventional production temperatures [8].…”

Section: Introductionmentioning

confidence: 99%

Production and Characterization of Niobium Toughened Ti-TiAl₃ Metallic-Intermetallic Composite

Yener

Zeytin

2017

Acta Phys. Pol. A

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Ti-TiAl3 in situ composites with 10 wt.% Nb were successfully prepared from Ti, Al, and Nb metallic powders by powder metallurgy processing technique of electric current activated/assisted sintering. The current and process time used for producing metallic-intermetallic composites were 2000 A and 90 s, respectively. In terms of fracture toughness, effects of addition of ductile niobium phase to Ti-TiAl3 composites were investigated. According to SEM-EDS and XRD results, the synthesized composites mainly consisted of TiAl3 matrix and dispersive Nb reinforcing phases, as well as ductile Ti phases. Hardness and fracture toughness values of the samples were measured by Vickers hardness tester under loads of 100 g and 10 kg, respectively. Fracture toughness value of TiAl3 intermetallic composites was increased with Nb ductile phase addititon from 1.69 ± 0.05 MPa m 1/2 to 5.23 ± 0.3 MPa m 1/2 .

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Thermodynamic properties of Ti–Al intermetallics

Cited by 34 publications

References 4 publications

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

A3B Intermetallics: Defect chemistry and nonstoichiometry

Production and Characterization of Niobium Toughened Ti-TiAl₃ Metallic-Intermetallic Composite

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Thermodynamic properties of Ti–Al intermetallics

Cited by 34 publications

References 4 publications

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

A3B Intermetallics: Defect chemistry and nonstoichiometry

Production and Characterization of Niobium Toughened Ti-TiAl3 Metallic-Intermetallic Composite

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Production and Characterization of Niobium Toughened Ti-TiAl₃ Metallic-Intermetallic Composite