The compositions of metastable phase precipitates observed at peak hardness condition in an Al-Mg-Si alloy

S. K. Son, S. Matsumura, K. Fukui, M. Takeda

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20 Citations (Scopus)

Abstract

The metastable-phase precipitates which appear at the peak condition of hardness in an Al-0.83 at%Mg-0.4 at%Si alloy were investigated, using a combination of Vickers microhardness tests, DSC calorimetry, and field-emission STEM observations with EDX analyses. EDX and elemental mapping revealed that both Si-rich and Mg-Si precipitates with needle-shapes were present. EDX analysis showed that needle-shaped β″precipitates protruding from the specimen foils were composed mainly of Si. The present results on structures, compositions and thermal stabilities of the precipitates suggest that Si-rich precipitates co-exist with complex Mg-Si precipitates also of needle-shape.

Original languageEnglish
Pages (from-to)241-245
Number of pages5
JournalJournal of Alloys and Compounds
Volume509
Issue number2
DOIs
Publication statusPublished - Jan 12 2011

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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