Diffusion in the titanium-aluminium system—I. Interdiffusion between solid Al and Ti or Ti-Al alloys

Loo, van Fjj Frans; Rieck, GD Gerard

doi:10.1016/0001-6160(73)90220-4

Cited by 377 publications

(109 citation statements)

References 7 publications

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“…which shows that IM1 and CaZn 13 are in equilibrium. This situation was reported previously [28,29]; it indicates that the local equilibrium is not achieved at the interface because IM2 or IM3 is missing between IM1 and CaZn 13 owing to their sluggish nucleation. To improve the reliability of the information obtained from the diffusion couples, 32 selected key alloys were used to study the phase relations, phase boundaries and crystallography of the ternary compounds in the Ca-Mg-Zn system.…”

Section: Solid-solid Diffusion Couples Figures 3(a) and (B)supporting

confidence: 71%

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Zhang

Kevorkov

Bridier

et al. 2011

Science and Technology of Advanced Materials

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Nine diffusion couples and 32 key samples were prepared to map the phase diagram of the Ca-Mg-Zn system. Phase relations and solubility limits were determined for binary and ternary compounds using scanning electron microscopy, electron probe microanalysis and x-ray diffraction (XRD). The crystal structure of the ternary compounds was studied by XRD and electron backscatter diffraction. Four ternary intermetallic (IM) compounds were identified in this system: Ca 3 Mg x Zn 15−x (4.6 x 12 at 335• C, IM1), Ca 14.5 Mg 15.8 Zn 69.7 (IM2), Ca 2 Mg 5 Zn 13 (IM3) and Ca 1.5 Mg 55.3 Zn 43.2 (IM4). Three binary compounds were found to have extended solid solubility into ternary systems: CaZn 11 , CaZn 13 and Mg 2 Ca form substitutional solid solutions where Mg substitutes for Zn atoms in the first two compounds, and Zn substitutes for both Ca and Mg atoms in Mg 2 Ca. The isothermal section of the Ca-Mg-Zn phase diagram at 335• C was constructed on the basis of the obtained experimental results. The morphologies of the diffusion couples in the Ca-Mg-Zn phase diagram at 335• C were studied. Depending on the terminal compositions of the diffusion couples, the two-phase regions in the diffusion zone have either a tooth-like morphology or contain a matrix phase with isolated and/or dendritic precipitates.

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Section: Solid-solid Diffusion Couples Figures 3(a) and (B)supporting

confidence: 71%

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Zhang

Kevorkov

Bridier

et al. 2011

Science and Technology of Advanced Materials

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“…However, there is also evidence that the opposite behaviour is the case for this diffusion couple [17,20], namely that Ti is predominantly diffusing into the Al rich side. In contrast, earlier works show that the only diffusing element in that system below 660°C is Al [21]. The increase in wire diameter in the present work indicates an effective material transport from the inside (Al rich) to the outside (Ti rich) of the wires.…”

Section: Mesostructurecontrasting

confidence: 93%

“…The calculated t R value characterizes the time, after which the volume fraction v(t R ) = 1 − 1 e has been transformed. The activation energy of the phase formation is calculated to 1.92 eV, which is in good agreement with the activation energy for Al diffusion in TiAl 3 (1.86 eV [21]). Therefore, it is concluded that the phase reaction is governed by nucleation mechanisms, while the growth is dominated by Al diffusion in TiAl 3 .…”

Section: Kinetics Of Tial 3 Phase Formationsupporting

confidence: 80%

“…The slight increase in resistivity for the samples annealed at the highest temperatures after reaching the saturation level indicates the start of a second phase reaction, e.g., TiAl 2 or Ti 3 Al, as already discussed. The formation of all possible aluminides once all Al reacted to TiAl 3 is also reported by van Loo and Rieck [21].…”

Section: Kinetics Of Tial 3 Phase Formationsupporting

confidence: 76%

“…According to the work of van Loo and Rieck [21], TiAl 3 is the only phase that is formed during the reaction in spite of possible interface layers as long as non-reacted Al is still existent. This is due to the high diffusivity of Al in TiAl 3 .…”

Section: Kinetics Of Tial 3 Phase Formationmentioning

confidence: 99%

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Processing of Intermetallic Titanium Aluminide Wires

Marr

Freudenberger

Kauffmann

et al. 2013

Metals

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This study shows the possibility of processing titanium aluminide wires by cold deformation and annealing. An accumulative swaging and bundling technique is used to co-deform Ti and Al. Subsequently, a two step heat treatment is applied to form the desired intermetallics, which strongly depends on the ratio of Ti and Al in the final composite and therefore on the geometry of the starting composite. In a first step, the whole amount of Al is transformed to TiAl 3 by Al diffusion into Ti. This involves the formation of 12% porosity. In a second step, the complete microstructure is transformed into the equilibrium state of γ-TiAl and TiAl 3 . Using this approach, it is possible to obtain various kinds of gradient materials, since there is an intrinsic concentration gradient installed due to the swaging and bundling technique, but the processing of pure γ-TiAl wires is possible as well.

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Sintering, Mechanical, Electrical and Oxidation Properties of Ceramic Intermetallic TiC‐Ti ₃ Al Composites from Nano‐TiC Particles

Fu¹,

Mondal²,

Koç³

2015

Advances in Solid Oxide Fuel Cells and Electronic Ceramics

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Diffusion in the titanium-aluminium system—I. Interdiffusion between solid Al and Ti or Ti-Al alloys

Cited by 377 publications

References 7 publications

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Processing of Intermetallic Titanium Aluminide Wires

Sintering, Mechanical, Electrical and Oxidation Properties of Ceramic Intermetallic TiC‐Ti ₃ Al Composites from Nano‐TiC Particles

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Diffusion in the titanium-aluminium system—I. Interdiffusion between solid Al and Ti or Ti-Al alloys

Cited by 377 publications

References 7 publications

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Processing of Intermetallic Titanium Aluminide Wires

Sintering, Mechanical, Electrical and Oxidation Properties of Ceramic Intermetallic TiC‐Ti 3 Al Composites from Nano‐TiC Particles

Contact Info

Product

Resources

About

Sintering, Mechanical, Electrical and Oxidation Properties of Ceramic Intermetallic TiC‐Ti ₃ Al Composites from Nano‐TiC Particles