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Persistent URL http://purl.org/net/epubs/work/54005
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Record Id 54005
Title High-temperature thermal stability of Ti2AlN and Ti4AlN3: A comparative diffraction study
Abstract The susceptibility of Ti<sub>2</sub>AlN and Ti<sub>4</sub>AlN<sub>3</sub> to high-temperature thermal dissociation in a dynamic environment of high-vacuum has been investigated using in situ neutron diffraction. Under high vacuum, these ternary nitrides decomposed above 1400°C through the sublimation of Al, and possibly Ti, to form a surface coating of TiN<sub>x</sub> (0.5&#8804;x&#8804;0.75). The kinetics of isothermal phase decomposition were modelled using the Avrami equation and the Avrami exponents (<i>n</i>) of isothermal decomposition of Ti<sub>2</sub>AlN and Ti<sub>4</sub>AlN<sub>3</sub> were determined to be 0.62 and 0.18, respectively. The characteristics of thermal stability and phase transitions in Ti<sub>2</sub>AlN and Ti<sub>4</sub>AlN<sub>3</sub> are compared in terms of the rate of decomposition, phase relations and microstructures.
Keywords Materials , Chemistry , Engineering , neutron diffraction , ternary nitride , Ti2AlN , Ti4AlN3 , sublimation , thermal decomposition
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Language English (EN)
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Journal Article J Eur Ceram Soc 31, no. 1-2 (2011): 159-166. doi:10.1016/j.jeurceramsoc.2010.09.014 2011