AlTiC particulate composite produced by a liquid state in situ process

Premkumar, M.; Chu, Miensheng

doi:10.1016/0921-5093(95)09787-2

Cited by 61 publications

(31 citation statements)

References 13 publications

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“…Assuming that the decomposition, Eq. [8], is much faster than the formation of Al 3 Ti, Eq. [7] in particular, the overall reaction kinetics are governed by the Al 3 Ti formation of which the process has been proposed to have two steps by the spherical shell model [36][37][38] as illustrated in Figure 10: (1) diffusion of Al to Ti through Al 3 Ti layer; and (2) reaction between Al and Ti at the Al 3 Ti/Ti interface.…”

Section: The Kinetics Of Al 3 Ti Formationmentioning

confidence: 99%

“…In this stage, Al 3 Ti phases are decomposed into [Ti] in the Al melt by Eq. [8], followed by diffusion of the solutes toward the surface of C particles. Finally the diffused [Ti] reacts with the solid C to form TiC by Eq.…”

Section: Sequence Of Microstructural Evolutionmentioning

confidence: 99%

“…In situ TiC, on the other hand, is a thermodynamically stable phase formed by a chemical reaction and exhibits a contamination free interface with the Al matrix. [4,[7][8][9][10][11] Among various in situ fabrication techniques suggested upto now, the self-propagating high temperature synthesis (SHS) developed by Merzhanov [12] is one of the most feasible and productive methods and involves ignition and self-sustaining combustion of reactants, which results in product formation.…”

Section: Al-based Metal Matrix Composites Reinforced Withmentioning

confidence: 99%

“…From a kinetic view point, it is, therefore, of importance that the decomposition of Al 3 Ti into [Ti] and liquid Al via Eqs. [6] to [8] needs to proceed to get those major reactions operated. Assuming that the decomposition, Eq.…”

Section: The Kinetics Of Al 3 Ti Formationmentioning

confidence: 99%

See 3 more Smart Citations

Al-TiC Composites Fabricated by a Thermally Activated Reaction Process in an Al Melt Using Al-Ti-C-CuO Powder Mixtures. Part I: Microstructural Evolution and Reaction Mechanism

Cho

Lee

Kim

2014

Metall Mater Trans A

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Al matrix composites reinforced with TiC particles are fabricated by a thermally activated reaction of Al-Ti-C powder mixtures in an Al melt. In the presence of CuO, reactant mixtures in the form of a pellet added to molten Al at temperatures higher than 1093 K (820°C) instantly reach the peak temperature over 1785 K (1512°C), followed by combustion wave propagation with in situ synthesizing TiC with a size of approximately 1 lm. Incomplete reaction products such as unreacted C, Al 3 Ti, and TiC aggregates are also observed. The pellet microstructure evolution upon the combustion reaction indicates that preheating temperature, i.e., the initial melt temperature, affects both the thermodynamic and kinetic characteristics of the reaction, and thereby influences the final microstructure of the Al/TiC composites. Based on the experimental and theoretical results, a sequence of the reaction leading upto the in situ synthesis of TiC is illustrated and the corresponding mechanism for the present process is proposed.

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Section: The Kinetics Of Al 3 Ti Formationmentioning

confidence: 99%

Section: Sequence Of Microstructural Evolutionmentioning

confidence: 99%

Section: Al-based Metal Matrix Composites Reinforced Withmentioning

confidence: 99%

Section: The Kinetics Of Al 3 Ti Formationmentioning

confidence: 99%

See 2 more Smart Citations

Al-TiC Composites Fabricated by a Thermally Activated Reaction Process in an Al Melt Using Al-Ti-C-CuO Powder Mixtures. Part I: Microstructural Evolution and Reaction Mechanism

Cho

Lee

Kim

2014

Metall Mater Trans A

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“…For example, TiC or TiB 2 can be produced by in-situ reaction to reinforce titanium matrix composites. 1,2) Premkumar, et al 3) synthesized TiC particles from pure Ti and C powder in molten Al to reinforce Al matrix material. Based on this method, a new method is developed.…”

Section: Introductionmentioning

confidence: 99%

The Synthesis of Composite Particles in Molten Salts

2006

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A novel process for synthesizing composite particles, named the high temperature molten salts method, is discussed in this paper. The molten salts are a reaction medium that do not take part in the chemical reaction and can be easily dissolved by water washing. By this method, composite particles were prepared in molten salts at 680-850 C. The heat released from the chemical reaction was found playing an important role to obtain the desired composite particles. The reverse martensitic transformation of the NiTi particles is confirmed in these composite particles by differential scanning calorimetry (DSC).

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