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    Kinetics of Decomposition in MAX Phases at Elevated Temperature

    Access Status
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    Authors
    Low, It-Meng (Jim)
    Pang, W.
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Low, I.M. and Pang, W.K. 2011. Kinetics of Decomposition in MAX Phases at Elevated Temperature. Materials Australia. 45 (2): pp. 33-35.
    Source Title
    Materials Australia
    School
    Department of Imaging and Applied Physics
    URI
    http://hdl.handle.net/20.500.11937/34403
    Collection
    • Curtin Research Publications
    Abstract

    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.

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