Microstructure and superplasticity in Al-Mg alloy composites reinforced with silicon nitride particles

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7 Citations (Scopus)

Abstract

The microstructure of Al-Mg alloy composite reinforced with α-Si3N4 particles was investigated. Matrix grain boundaries were segregated with Si, N and O, and contain no secondary phases. On the other hand, matrix/reinforcement interfaces contain Mg2Si, MgO, and Al2MgO4. X-ray energy dispersive data also indicated a gradual variation of the N concentration across the reaction zone and enrichment of Mg at the interface between the matrix and the reaction zone. In situ TEM observation using a heating stage revealed incipient melting along grain boundaries and interfaces at 827 K. A liquid pocket was also observed at triple junctions. A good agreement in incipient melting temperature was obtained between TEM and DSC results. A possible role of the liquid phase in the superplasticity is discussed.

Original languageEnglish
Pages (from-to)277-286
Number of pages10
JournalMaterials Science Forum
Volume243-245
Publication statusPublished - 1997 Jan 1

Keywords

  • Grain boundary
  • Interface
  • Microstructure
  • Segregation
  • Superplasticity

ASJC Scopus subject areas

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

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