Formation of Ti 3 AlC 2 by mechanically induced self-propagating reaction in Ti–Al

Abstract

The formation of Ti₃AlC₂ was first investigated by mechanically induced self-propagating reaction (MSR) in Ti–Al–C system at room temperature. The effects of the milling parameters on the formation of Ti₃AlC₂ were discussed. The phase composition and microstructure were analysed and observed by using X-ray diffraction and scanning electron microscopy, respectively. The formation mechanism of Ti₃AlC₂ was analysed. An MSR was ignited during mechanical alloying of Ti, Al and C powders after a short time. An exothermic reaction between Ti and Al in the Ti–Al–C system first occurred after a certain milling time. Then, Ti–C reaction was induced at high temperature. All of the above reactions were exothermic that resulted in Ti–Al liquid formation. The previously formed TiC dissolved into and nucleated in the Ti–Al liquid. At last, Ti₃AlC₂ formed between the Ti–Al melt and the TiC. The final products consist of Ti₃AlC₂, TiC and Al₃Ti.

Keywords

MECHANICALLY INDUCED SELF-PROPAGATING REACTION TI3ALC2 CERAMICS MICROSTRUCTURE

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Formation of Ti 3 AlC 2 by mechanically induced self-propagating reaction in Ti–Al–C system at room temperature

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