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In situ diffraction study of thermal decomposition in Maxthal Ti(2)AlC

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Authors
Pang, W.
Low, It-Meng (Jim)
O'Connor, Brian
Peterson, V.
Studer, A.
Palmquist, J.
Date
2011
Type
Journal Article

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Pang, W.K. and Low, I.M. and O'Connor, B.H. and Peterson, V.K. and Studer, A.J. and Palmquist, J.P. 2011. In situ diffraction study of thermal decomposition in Maxthal Ti(2)AlC. Journal of Alloys and Compounds. 509: pp. 172-176.
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Journal of Alloys and Compounds
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Department of Imaging and Applied Physics
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Abstract

The thermal stability of Ti(2)AlC at elevated temperature (1000–1550 °C) in vacuum has been investigated using in situ neutron diffraction. At temperatures above 1400 °C, Ti(2)AlC became unstable and began to decompose via sublimation of Al, resulting in a porous surface layer of TiCx being formed. The apparent activation energy for Ti2AlC decomposition was determined to be 85.7±2.6 kJ mol(-1). The kinetics of isothermal phase decomposition was modelled using least-squares linear regression fitting and the Avrami equation. The corresponding least-squares regression exponent (R2) and Avrami constants (k and n) for isothermal decomposition were determined to be 0.89, 0.268 min(-n) and 0.1, respectively.