In situ diffraction study on decomposition of Ti2AlN at 1500–1800°C in vacuum

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dc.contributor.authorPang, WKen_AU
dc.contributor.authorLow, IMen_AU
dc.contributor.authorKennedy, SJen_AU
dc.contributor.authorSmith, RIen_AU
dc.date.accessioned2011-01-14T05:26:33Zen_AU
dc.date.available2011-01-14T05:26:33Zen_AU
dc.date.issued2010-11-25en_AU
dc.date.statistics2010-11-25en_AU
dc.description.abstractThe 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. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationPang, W. K., Low, I. M., Kennedy, S. J., & Smith, R. I. (2010). In situ diffraction study on decomposition of Ti2AlN at 1500–1800°C in vacuum. Materials Science and Engineering: A - Structural Materials Properties Microstructure and Processing, 528(1), 137-142.en_AU
dc.identifier.govdoc3115en_AU
dc.identifier.issn0921-5093en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleMaterials Science and Engineering: A - Structural Materials Properties Microstructure and Processingen_AU
dc.identifier.pagination137-142en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.msea.2010.08.012en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2919en_AU
dc.identifier.volume528en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectNeutron diffractionen_AU
dc.subjectDecompositionen_AU
dc.subjectDissociationen_AU
dc.subjectAluminiumen_AU
dc.subjectPhase transformationsen_AU
dc.subjectScanning electron microscopyen_AU
dc.titleIn situ diffraction study on decomposition of Ti2AlN at 1500–1800°C in vacuumen_AU
dc.typeJournal Articleen_AU
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