Kinetics of directed oxidation of Al-Mg alloys into Al2O3 preforms

H. Venugopalan, Tarasankar Debroy

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Synthesis of oxide matrix composites by the directed metal oxidation process offers significant advantages over traditional composite processing routes. Much of the previous work on directed oxidation has been focused on the understanding of the microstructural evolution during the process. In this work, growth kinetics of Al2O3/Al composites through Al2O3 preforms has been studied. The mechanism of oxidation of Al-Mg alloys into Al2O3 preforms has been investigated theoretically and experimentally. Analysis of the oxidation kinetics for various preform particle sizes and durations of oxidation demonstrates that the preform provides preferential sites for Al2O3 nucleation. Furthermore, the weight gain rate increases with decreasing Al2O3 particle size. With increasing oxidation time, liquid metal transport to the oxidation front slows down and becomes a factor in controlling the weight gain rate. The oxidation rate of Al alloys into Al2O3 preforms can be tailored by the control of preform particle size.

Original languageEnglish (US)
Pages (from-to)39-46
Number of pages8
JournalMaterials Science and Engineering A
Volume232
Issue number1-2
StatePublished - Jul 31 1997

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preforms
Oxidation
oxidation
kinetics
Particle size
composite materials
Composite materials
Growth kinetics
Microstructural evolution
liquid metals
Liquid metals
Oxides
Nucleation
Metals
routes
nucleation
oxides
synthesis
matrices
Processing

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "Synthesis of oxide matrix composites by the directed metal oxidation process offers significant advantages over traditional composite processing routes. Much of the previous work on directed oxidation has been focused on the understanding of the microstructural evolution during the process. In this work, growth kinetics of Al2O3/Al composites through Al2O3 preforms has been studied. The mechanism of oxidation of Al-Mg alloys into Al2O3 preforms has been investigated theoretically and experimentally. Analysis of the oxidation kinetics for various preform particle sizes and durations of oxidation demonstrates that the preform provides preferential sites for Al2O3 nucleation. Furthermore, the weight gain rate increases with decreasing Al2O3 particle size. With increasing oxidation time, liquid metal transport to the oxidation front slows down and becomes a factor in controlling the weight gain rate. The oxidation rate of Al alloys into Al2O3 preforms can be tailored by the control of preform particle size.",
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Kinetics of directed oxidation of Al-Mg alloys into Al2O3 preforms. / Venugopalan, H.; Debroy, Tarasankar.

In: Materials Science and Engineering A, Vol. 232, No. 1-2, 31.07.1997, p. 39-46.

Research output: Contribution to journalArticle

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