Morphology Evolution of TiCx Grains During SHS in an Al−Ti−C System

Jin, Shenbao; Shen, Ping; Zou, Binglin; Jiang, Qi‐Chuan

doi:10.1021/cg800527q

Cited by 50 publications

(49 citation statements)

References 14 publications

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“…A large amount of TiC octahedrons were synthesized by SHS using Al, Ti, C elemental powders [26]. It is also suggested that the morphologies of TiC evolve from octahedron to cuboctahedron and finally to sphere with the increase in the combustion temperature [12]. Besides, TiC crystal can exhibit a hexagonal platelet shape under the influence of Si and Al element [27].…”

Section: Discussion About the Growth Mechanism Of Ticmentioning

confidence: 99%

“…However, in the present experimental state, the reaction between Ti and C is such severe resulting in a very high temperature (1400-1500 • C) at a local scale and it is far from the equilibrium condition. Besides, it has been suggested that TiC crystals exhibit a truncated octahedron shape at a certain temperature [12]. Therefore, most of the TiC crystals in M2 master alloy behave as a polyhedron shape or imperfect octahedron.…”

Section: Discussion About the Growth Mechanism Of Ticmentioning

confidence: 99%

“…TiC can be synthesized and fabricated by powder metallurgy [8], floating zone technique [9], reactive sintering [10], chemical vapor deposition (CVD) [11], melt reaction method [5], self-propagating high-temperature synthesis (SHS) [12] and so on. Especially, melt reaction method is one of the most popular means for the fabrication of effective Al-Ti-C (B) master alloys [4,5,13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of trace boron on the morphology of titanium carbide in an Al–Ti–C–B master alloy

Nie

Liu

2010

Journal of Alloys and Compounds

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Section: Discussion About the Growth Mechanism Of Ticmentioning

confidence: 99%

Section: Discussion About the Growth Mechanism Of Ticmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of trace boron on the morphology of titanium carbide in an Al–Ti–C–B master alloy

Nie

Liu

2010

Journal of Alloys and Compounds

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“…16) Figure 2 shows the HTXRD results from the Al-Ti-C mixture (20 mass% Al) at room temperature, 650, 660, and 670°C. The crystal structure shown at 25°C and 650°C was in the Al and the Ti phase.…”

Section: Resultsmentioning

confidence: 99%

Phase Formation and Interfacial Phenomena of the In-Situ Combustion Reaction of Al-Ti-C in TiC/Mg Composites

Jeon

Lee

et al. 2015

Mater. Trans.

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Phase evolution and interfacial characteristics through the combustion reaction of Al-Ti-C system were investigated, in terms of the reaction mechanism. The phase formation in the reaction system at 650, 660, and 670°C by in-situ high temperature X-ray diffraction (HT-XRD) showed the formation of the solid Al 3 Ti phase, along with melting of the Al at 660°C. Microstructural analysis of the Al-Ti-C system after holding at 670°C was carried out to identify the reaction mechanisms, which were the formation and growth of the Al 3 Ti phase by dissolving Ti in molten Al. This phase occurs with further contact with C, and would initiate the combustion reaction to produce a more thermodynamically stable TiC phase. Mg-infiltrated 3.04 mm in the Al-TiC substrate was compared to 5.42 mm in the Al-Ti-C system, at the same time and temperature from the infiltration test. The apparent activation energy obtained for Al-TiC system was 350.84 kJ/mol, which was higher than that of the Al-Ti-C system (307.31 kJ/mol). The formation of the Al 3 Ti phase in the Al-Ti-C system was also observed from the crystal structural analysis on the infiltrated area; therefore, the in-situ combustion reaction in Al-Ti-C system promoted the wetting of Mg.

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“…But it is found that many factors, such as synthesis methods and prepared temperature, will influence the growth processes of TiC, which makes it grow into other shapes. For example, Jin et al [5] found that TiC would be evolved from octahedron to spherical shapes when prepared by self-propagating hightemperature synthesis (SHS) method. In addition, TiC with rod [6] and whisker [7] shapes were also reported.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of boron and its relationship with morphologies of TiC

et al. 2014

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First-principle calculations were performed to study the adsorption of boron and its relationship with the morphologies of TiC. It is found that although the adsorption of boron on all the low-index TiC crystal planes is thermally favorable, it will be adsorbed more easily by C-terminated {111} and {011} planes, while less possible to be adsorbed by {001}. The study of the formation of B-B clusters indicates that the distribution of boron adatoms on C-terminated (111) and {011} planes will be more uniform, and the diffusion of the adatom further confirms the above results. According to the geometry relationship and growth rate of different crystal planes, it is deduced that the adsorption of boron on TiC will seriously impede the growth of {111} and {011} planes, which can make TiC grow into hexagonal platelets.

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Morphology Evolution of TiC_x Grains During SHS in an Al−Ti−C System

Cited by 50 publications

References 14 publications

Influence of trace boron on the morphology of titanium carbide in an Al–Ti–C–B master alloy

Influence of trace boron on the morphology of titanium carbide in an Al–Ti–C–B master alloy

Phase Formation and Interfacial Phenomena of the <i>In-Situ</i> Combustion Reaction of Al-Ti-C in TiC/Mg Composites

Adsorption of boron and its relationship with morphologies of TiC

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