Interfacial reaction between the oxidized SiC particles and Al-Mg alloys

Z. Shi, M. Gu, J. Liu, G. Liu, Jae-chul Lee, D. Zhang, R. Wu

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4 Citations (Scopus)

Abstract

The interfacial reactions of oxidized SiC particles reinforced Al-Mg matrix composites were investigated by the field emission-scanning electron microscopy (FESEM), TEM and X-ray diffraction. It was found that the nanoscale MgO forms initially due to the interfacial reaction, then whether it reacts with molten Al continuously or not depends on the content of Mg in the matrix and its covering densification at the surface of particles. When there is not enough Mg in the matrix for the formation of dense MgO layer, MgO will transform into MgAl2O4 crystal owing to the continuous reaction with SiO2 and molten Al. When dense MgO layer forms at the surface of the particles due to the affluence of Mg for the initial reaction, it will protect the inner SiC from the attack of molten Al. However, the reaction products of both MgO and MgAl2O4 are thermo-stable phases at the surface of the particles under high temperature. The results clarify the interfacial reaction route and they are of great value to the control of the interfacial reactions and their interfacial design of the composites.

Original languageEnglish
Pages (from-to)1948-1952
Number of pages5
JournalChinese Science Bulletin
Volume46
Issue number23
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Al-Mg matrix composite
  • FE-SEM
  • Interfacial reaction
  • MgAlO
  • Nanoscale MgO
  • Oxidized SiC particle

ASJC Scopus subject areas

  • General

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  • Cite this

    Shi, Z., Gu, M., Liu, J., Liu, G., Lee, J., Zhang, D., & Wu, R. (2001). Interfacial reaction between the oxidized SiC particles and Al-Mg alloys. Chinese Science Bulletin, 46(23), 1948-1952.