Role of Pore Microstructures on the Decomposition Kinetics in MAX-Phase Composites
In this paper, the role of pore microstructures on the susceptibility of MAX- phase composites to thermal dissociation at 1300-1800 °C in high vacuum has been studied using in-situ neutron diffraction. Positive activation energies were determined for the decomposition of MAX phases except for Ti3AlC...
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| Format: | Conference Paper |
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Asian-Australasian Association for Composite Materials (AACM)
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/24714 |
| _version_ | 1848751506416730112 |
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| author | Low, It Meng Pang, W. |
| author2 | M. Jaafar |
| author_facet | M. Jaafar Low, It Meng Pang, W. |
| author_sort | Low, It Meng |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | In this paper, the role of pore microstructures on the susceptibility of MAX- phase composites to thermal dissociation at 1300-1800 °C in high vacuum has been studied using in-situ neutron diffraction. Positive activation energies were determined for the decomposition of MAX phases except for Ti3AlC2 where negative activation energy of 71.9 kJ mol-1 was obtained due to formation of fine pores on TiCx. An Avrami exponent (n) of < 1.0 was determined, indicative of the highly restricted diffusion of Al or Si between the channels of M6X octohedra. The pore microstructure of decomposed MAX phase has been shown to play a vital role in the kinetics of decomposition with coarse-pores facilitating the decomposition process but the fine-pores hindering it. |
| first_indexed | 2025-11-14T07:53:49Z |
| format | Conference Paper |
| id | curtin-20.500.11937-24714 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:53:49Z |
| publishDate | 2012 |
| publisher | Asian-Australasian Association for Composite Materials (AACM) |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-247142023-02-02T07:57:40Z Role of Pore Microstructures on the Decomposition Kinetics in MAX-Phase Composites Low, It Meng Pang, W. M. Jaafar A. R. Azura K. H. Leong A. Y. L. Leong In this paper, the role of pore microstructures on the susceptibility of MAX- phase composites to thermal dissociation at 1300-1800 °C in high vacuum has been studied using in-situ neutron diffraction. Positive activation energies were determined for the decomposition of MAX phases except for Ti3AlC2 where negative activation energy of 71.9 kJ mol-1 was obtained due to formation of fine pores on TiCx. An Avrami exponent (n) of < 1.0 was determined, indicative of the highly restricted diffusion of Al or Si between the channels of M6X octohedra. The pore microstructure of decomposed MAX phase has been shown to play a vital role in the kinetics of decomposition with coarse-pores facilitating the decomposition process but the fine-pores hindering it. 2012 Conference Paper http://hdl.handle.net/20.500.11937/24714 Asian-Australasian Association for Composite Materials (AACM) restricted |
| spellingShingle | Low, It Meng Pang, W. Role of Pore Microstructures on the Decomposition Kinetics in MAX-Phase Composites |
| title | Role of Pore Microstructures on the Decomposition Kinetics in MAX-Phase Composites |
| title_full | Role of Pore Microstructures on the Decomposition Kinetics in MAX-Phase Composites |
| title_fullStr | Role of Pore Microstructures on the Decomposition Kinetics in MAX-Phase Composites |
| title_full_unstemmed | Role of Pore Microstructures on the Decomposition Kinetics in MAX-Phase Composites |
| title_short | Role of Pore Microstructures on the Decomposition Kinetics in MAX-Phase Composites |
| title_sort | role of pore microstructures on the decomposition kinetics in max-phase composites |
| url | http://hdl.handle.net/20.500.11937/24714 |