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Diffraction study of thermal dissociation in the ternary Ti-Al-C system

Journal Article


Abstract


  • Titanium aluminum carbide exhibits a unique combination of characteristics of both metals and ceramics coupled with an unusual combination of mechanical, electrical and thermal properties. In this paper, the effect of high-vacuum annealing on the phase stability and phase transition of Ti2AlC and Ti3AlC2 at up to 1550°C was studied using in-situ neutron diffraction. The decomposition of and Ti2AlC and Ti3AlC2 into TiC was observed from the change of relative phase abundances as a function of temperature. Apparent activation energies of phase decomposition of 85.68 and -71.9 kJ/mol were determined for Ti2AlC and Ti3AlC2 respectively. Nearsurface composition depth profiling using grazing-incidence synchrotron radiation diffraction has revealed a graded phase composition in vacuum-decomposed surfaces.

Publication Date


  • 2009

Citation


  • Pang, W. K., & Low, I. M. (2009). Diffraction study of thermal dissociation in the ternary Ti-Al-C system. Journal of the Australian Ceramic Society, 45(2), 30-33.

Scopus Eid


  • 2-s2.0-70849125431

Web Of Science Accession Number


Start Page


  • 30

End Page


  • 33

Volume


  • 45

Issue


  • 2

Abstract


  • Titanium aluminum carbide exhibits a unique combination of characteristics of both metals and ceramics coupled with an unusual combination of mechanical, electrical and thermal properties. In this paper, the effect of high-vacuum annealing on the phase stability and phase transition of Ti2AlC and Ti3AlC2 at up to 1550°C was studied using in-situ neutron diffraction. The decomposition of and Ti2AlC and Ti3AlC2 into TiC was observed from the change of relative phase abundances as a function of temperature. Apparent activation energies of phase decomposition of 85.68 and -71.9 kJ/mol were determined for Ti2AlC and Ti3AlC2 respectively. Nearsurface composition depth profiling using grazing-incidence synchrotron radiation diffraction has revealed a graded phase composition in vacuum-decomposed surfaces.

Publication Date


  • 2009

Citation


  • Pang, W. K., & Low, I. M. (2009). Diffraction study of thermal dissociation in the ternary Ti-Al-C system. Journal of the Australian Ceramic Society, 45(2), 30-33.

Scopus Eid


  • 2-s2.0-70849125431

Web Of Science Accession Number


Start Page


  • 30

End Page


  • 33

Volume


  • 45

Issue


  • 2