Single-phase interdiffusion in TiAl

Sprengel, Wolfgang; Oikawa, Naoki; Nakajima, Hideo

doi:10.1016/0966-9795(94)00033-6

Cited by 74 publications

(40 citation statements)

References 7 publications

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“…An apparent activation energy Q of 160.4 kJ/mole was also obtained [8]. This value is much lower than the activation enthalpy (Q v = 295 kJ/mole [9,10], 330 kJ/mole [11]) for lattice diffusion of Ti in γ-TiAl. However, it is close to the activation enthalpy for diffusion of O in γ-TiAl (177 kJ/mole) [12], O in Ti (168 kJ/mole) [13], O in Ti-6Al-4Zr-2Mo-2Sn (167.2 kJ/mole) [14], and C in Ti (127.6 kJ/mole) [15].…”

Section: Introductionmentioning

confidence: 94%

Role of Interfacial Dislocations on Creep of a Fully Lamellar TiAl

Hsiung

Nieh²

1999

KEM

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Section: Introductionmentioning

confidence: 94%

Role of Interfacial Dislocations on Creep of a Fully Lamellar TiAl

Hsiung

Nieh²

1999

KEM

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“…The diffusion properties including the self-diffusion, interdiffusion and grain-boundary diffusion in TiAl have been widely investigated. [7][8][9][10] Especially, it is interesting that the diffusion of Ti in TiAl shows anisotropy, 10) where the diffusion coefficient of Ti in the direction perpendicular to the [001] is larger than in the direction parallel to [001]. However such diffusion anisotropy is known only in TiAl and a general argument is not yet established at present.…”

Section: Introductionmentioning

confidence: 99%

On-the-Fly Kinetic Monte Carlo Simulation of Atomic Diffusion in <I>L</I>1<SUB>0</SUB> Structure

2011

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The atomic diffusion in L1 0 ordered phase is investigated using on-the-fly kinetic Monte Carlo simulations. We construct a simple model system of L1 0 ordered phase. Although a simple model system is employed, the simulation results reveal quite complex aspects of the atomic diffusion. It is found that the activation energies of both constituent atoms change significantly depending on the composition and that the correlation factor makes the activation energy larger for both atoms. It is also demonstrated that the diffusion anisotropy in the L1 0 phase which is observed in the experiment is reproduced. We discuss the different diffusion behavior of the constituent atoms, and clarify the mechanism of the diffusion anisotropy in L1 0 phase.

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“…This increase in mechanical properties may be related to the solid solution Table 2) and/or the improvement in ductility of Ti-aluminides due to non-existence of brittle Al 3 Ti layers. It should be pointed out that similar studies were also carried out by two research groups 15,16) to investigate for the fabrication of composites consisting of Ti and Ti-aluminides using a vacuum hot pressing technique. As described above, the tensile strength (810 MPa) obtained in this study is higher than that (470 MPa) by Alman et al 17) and that (550 MPa) by Enoki et al…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…1(d, e, f Table 2 EPMA results (in at%) for a COMP24 specimen scanned from regions shown in Fig. 2(d, e, f Properties of Ti-Aluminides-Reinforced Ti-Matrix Laminate Fabricated by Pulsed-Current Hot Pressing (PCHP)t ¼ 0 : Interdiffusion coefficients in TiAl and Ti 3 Al are reported by Sprengel et al 15,16) The thickness of an Al 3 Ti layer in COMP12 fabricated at 1273 K is 3 mm and that in COMP24 fabricated at 1373 K is 10 mm, as shown in Figs. 2 and 3.…”

Section: Microstructurementioning

confidence: 99%

Properties of Ti-Aluminides-Reinforced Ti-Matrix Laminate Fabricated by Pulsed-Current Hot Pressing (PCHP)

et al. 2004

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Ti-aluminides-reinforced Ti-matrix composites were fabricated from 0.04 mm-thick Ti foils and 0.012 mm-and 0.024 mm-thick aluminum foils, in a process using a pulsed-current hot pressing (PCHP) equipment, and the effect of reaction temperature on properties of the composites was investigated. The composites were of laminated structure and composed of Ti and reacted layers containing Ti-aluminides. The composition of the reacted layers was dependent on the reaction temperature employed. Tensile testing at room temperature revealed that the reaction temperature was effective for the mechanical properties, including tensile strength, elongation and fracture mode, of the composites. The tensile strength and the elongation of composites fabricated at 1273 K from 0.04-mm-thick Ti and 0.012-mm-thick Al foils were 810 MPa and 3.64%, respectively, while they were 677 MPa and 3.44% for composites fabricated at 1173 K. Microstructure observations of fractured specimens showed that Ti layers of the composites fabricated at 1173 and 1273 K played a significant role in improving ductility by prohibiting the growth of numerous cracks emanating from Ti-aluminides.

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Single-phase interdiffusion in TiAl

Cited by 74 publications

References 7 publications

Role of Interfacial Dislocations on Creep of a Fully Lamellar TiAl

Role of Interfacial Dislocations on Creep of a Fully Lamellar TiAl

On-the-Fly Kinetic Monte Carlo Simulation of Atomic Diffusion in <I>L</I>1<SUB>0</SUB> Structure

Properties of Ti-Aluminides-Reinforced Ti-Matrix Laminate Fabricated by Pulsed-Current Hot Pressing (PCHP)

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