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Persistent URL http://purl.org/net/epubs/work/53947
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Record Id 53947
Title In situ diffraction study on decomposition of Ti2AlN at 1500-1800°C in vacuum
Abstract The susceptibility of Ti2AlN to thermal dissociation at 1500-1800°C in high-vacuum has been studied using in situ neutron diffraction. Above 1500°C, Ti2AlN decomposed to TiNx primarily through the sublimation of aluminium (Al). The kinetics of isothermal phase decomposition at 1550°C was modelled using a modified Avrami equation. An Avrami exponent (n) of 0.338 was determined, indicative of the highly restricted out-diffusion of Al between the channels of Ti6N octahedra. The characteristics of thermal stability and phase transition in Ti2AlN are discussed. Characterisation of surface compositions and examination of cross-sectional microstructures of decomposed Ti2AlN, using synchrotron radiation diffraction and SEM, respectively, verify the findings of the neutron diffraction; that Ti2AlN decomposes to TiNx at the surface primarily via the sublimation of Al from grain boundaries.
Keywords Materials , Chemistry , Engineering , Neutron Diffraction , MAX phase , Ti2AlN phase , TiN , Decomposition
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Language English (EN)
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Journal Article Mater Sci Eng A 528, no. 1 (2010): 137-142. doi:10.1016/j.msea.2010.08.012 2010