Change in microstructure during aging at 1273k inti-40at. %alalloy

Makoto Tanimura, Yasuhide Inoue, Yasumasa Koyama, Makoto Kikuchi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Features of the →a2+y precipitation reaction in a Ti-40at. %Al alloy were investigated by transmission electron microscopy. In an as-quenched sample without aging, the a phase with the hep structure already transforms into the a 2 phase with the D019 one as a matrix and a phase with the B19 one as an intermediate precipitate. When the sample is aged at 1273K, amorphous regions are nucleated at the B19 intermediate precipitates and grow in the matrix. On further aging, the amorphous region is converted to a lenticular-shape precipitate with the L10 structure of the γ phase. The α 2/γ lamellar structure is eventually produced by the lateral growth of the lenticular-shape precipitates.

Original languageEnglish
Pages (from-to)1190-1196
Number of pages7
JournalMaterials Transactions, JIM
Volume37
Issue number5
DOIs
Publication statusPublished - 1996 Jan 1

Keywords

  • Amorphous state
  • Ordered structure
  • Precipitation reaction
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Engineering(all)

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