In situ diffraction study on decomposition of Ti2AlN at 1500–1800 °C in vacuum
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...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Elsevier
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/35541 |
| _version_ | 1848754524790980608 |
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| author | Pang, Wei Kong Low, It-Meng (Jim) Kennedy, S. Smith, R. |
| author_facet | Pang, Wei Kong Low, It-Meng (Jim) Kennedy, S. Smith, R. |
| author_sort | Pang, Wei Kong |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T08:41:47Z |
| format | Journal Article |
| id | curtin-20.500.11937-35541 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:41:47Z |
| publishDate | 2010 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-355412019-02-19T04:28:06Z In situ diffraction study on decomposition of Ti2AlN at 1500–1800 °C in vacuum Pang, Wei Kong Low, It-Meng (Jim) Kennedy, S. Smith, R. Neutron diffraction MAX phase TiN Decomposition Ti2AlN 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. 2010 Journal Article http://hdl.handle.net/20.500.11937/35541 10.1016/j.msea.2010.08.012 Elsevier fulltext |
| spellingShingle | Neutron diffraction MAX phase TiN Decomposition Ti2AlN Pang, Wei Kong Low, It-Meng (Jim) Kennedy, S. Smith, R. In situ diffraction study on decomposition of Ti2AlN at 1500–1800 °C in vacuum |
| title | In situ diffraction study on decomposition of Ti2AlN at 1500–1800 °C in vacuum |
| title_full | In situ diffraction study on decomposition of Ti2AlN at 1500–1800 °C in vacuum |
| title_fullStr | In situ diffraction study on decomposition of Ti2AlN at 1500–1800 °C in vacuum |
| title_full_unstemmed | In situ diffraction study on decomposition of Ti2AlN at 1500–1800 °C in vacuum |
| title_short | In situ diffraction study on decomposition of Ti2AlN at 1500–1800 °C in vacuum |
| title_sort | in situ diffraction study on decomposition of ti2aln at 1500–1800 °c in vacuum |
| topic | Neutron diffraction MAX phase TiN Decomposition Ti2AlN |
| url | http://hdl.handle.net/20.500.11937/35541 |