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dc.contributor.authorLow, It-Meng (Jim)
dc.contributor.authorPang, W.
dc.date.accessioned2017-01-30T13:49:17Z
dc.date.available2017-01-30T13:49:17Z
dc.date.created2012-03-15T20:01:01Z
dc.date.issued2011
dc.identifier.citationLow, I.M. and Pang, W.K. 2011. Kinetics of Phase Decomposition in MAX Phases - A Comparative Diffraction Study. Journal of the Australasian Ceramic Society. 47 (2): pp. 16-23.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/35358
dc.description.abstract

The susceptibility of MAX phases to thermal dissociation at 1300-1550 °C in high vacuum has been studied using in-situ neutron diffraction. Above 1400 °C, MAX phases decomposed to binary carbide (e.g. TiCx) or binary nitride (e.g. TiNx), primarily through the sublimation of A-elements such as Al or Si, which results in a porous surface layer of MXx being formed. 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. The kinetics of isothermal phase decomposition at 1550 °C was modelled using a modified Avrami equation. An Avrami exponent (n) of < 1.0 was determined, indicative of the highly restricted diffusion of Al or Si between the channels of M6X octahedra. The characteristics of thermal stability and phase transition are discussed.

dc.publisherAustralasian Ceramic Society
dc.subjectactivation energy
dc.subjectdecomposition
dc.subjectneutron diffraction
dc.subjectAvrami kinetics
dc.subjectMAX phases
dc.titleKinetics of Phase Decomposition in MAX Phases - A Comparative Diffraction Study
dc.typeJournal Article
dcterms.source.volume47
dcterms.source.number2
dcterms.source.startPage16
dcterms.source.endPage23
dcterms.source.issn10186689
dcterms.source.titleJournal of the Australasian Ceramic Society
curtin.departmentDepartment of Imaging and Applied Physics
curtin.accessStatusFulltext not available


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