Effects of microstructure on high temperature mechanical properties of Al3Ti-Mo3Al two-phase intermetallic alloys

Seiji Miura, Hiroyuki Shimamura, Juri Fujinaka, Tetsuo Mohri

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10 Citations (Scopus)

Abstract

The high temperature deformation behavior of two-phase intermetallic-based alloys composed of the D022-Al3Ti and A15-Mo 3Al phases is investigated. It is found that the equi-axed two-phase structure formed by an isothermal heat treatment is very stable even after a high-temperature heat treatment and, moreover, the microstructure is retained even after heavy deformation at high temperature. The strain-rate sensitivity m is 0.3 or higher, and a steady state deformation is attained. Compressive deformability is found to be extremely high with the equi-axed two-phase structure. Conversely, a lamellar structure was found to be unstable during deformation. The strain-rate sensitivity m of the specimens with a lamellar structure is almost the same as that of the equi-axed two-phase structure, and the resulting microstructure strongly suggests that the deformation is concentrated at the boundaries between the lamellar colonies, where the equi-axed two-phase structure is formed during deformation by spheroidization.

Original languageEnglish
Pages (from-to)771-777
Number of pages7
JournalIntermetallics
Volume12
Issue number7-9 SPEC. ISS.
DOIs
Publication statusPublished - 2004 Jul

Keywords

  • A. Aluminides, miscellaneous
  • B. Mechanical properties at high temperatures
  • B. Phase transformation
  • D. Microstructure

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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