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Role of pore microstructures on the decomposition kinetics in MAX-phase composites

Conference Paper


Abstract

  • 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 neutrondiffraction. Positive activation energies were determined for the decomposition of MAX phases except for Ti 3AlC2 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. Copyright © (2012) by Asian-Australasian Association for Composite Materials (AACM).

Publication Date

  • 2012

Citation

  • Low, I. M., & Pang, W. K. (2012). Role of pore microstructures on the decomposition kinetics in MAX-phase composites. In 8th Asian-Australasian Conference on Composite Materials 2012, ACCM 2012 - Composites: Enabling Tomorrow's Industry Today Vol. 1 (pp. 597-602).

Scopus Eid

  • 2-s2.0-84893009054

Web Of Science Accession Number

Start Page

  • 597

End Page

  • 602

Volume

  • 1

Abstract

  • 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 neutrondiffraction. Positive activation energies were determined for the decomposition of MAX phases except for Ti 3AlC2 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. Copyright © (2012) by Asian-Australasian Association for Composite Materials (AACM).

Publication Date

  • 2012

Citation

  • Low, I. M., & Pang, W. K. (2012). Role of pore microstructures on the decomposition kinetics in MAX-phase composites. In 8th Asian-Australasian Conference on Composite Materials 2012, ACCM 2012 - Composites: Enabling Tomorrow's Industry Today Vol. 1 (pp. 597-602).

Scopus Eid

  • 2-s2.0-84893009054

Web Of Science Accession Number

Start Page

  • 597

End Page

  • 602

Volume

  • 1