Show simple item record

dc.contributor.authorLow, It-Meng (Jim)
dc.contributor.authorPang, W.
dc.identifier.citationLow, I.M. and Pang, W.K. 2011. Kinetics of Decomposition in MAX Phases at Elevated Temperature. Materials Australia. 45 (2): pp. 33-35.

The susceptibility of MAX phases to thermal dissociation at 1300-1800 °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 ofM6X octohedra. The characteristics of thermal stability and phase transition are discussed.

dc.publisherInstitute of Materials Engineering Australasia Ltd
dc.titleKinetics of Decomposition in MAX Phases at Elevated Temperature
dc.typeJournal Article
dcterms.source.titleMaterials Australia
curtin.departmentDepartment of Imaging and Applied Physics
curtin.accessStatusFulltext not available

Files in this item


This item appears in the following Collection(s)

Show simple item record