Effect of microstructure on mechanical properties in intermetallic compound Ti3Al-Nb

Masahiko Iwai, Tomoaki Hirota, Mitsuo Niinomi, Toshiro Kobayashi

Research output: Contribution to journalArticlepeer-review

Abstract

Effect of microstructure on tensile properties and fracture toughness of Ti3Al-Nb was investigated. The tensile properties and fracture toughness decrease with increase in the size of primary α2. The tensile strength increases with decrease in the volume fraction of primary α2 while the elongation and reduction of area decrease. The fracture toughness increases with decrease in the volume fraction of primary α2 when the volume fraction of primary α2 is between 8 and 17%. Decreasing cooling rate after solutionizing from water quenching to air cooling decreases tensile properties and fracture toughness in non-aged specimen because of the formation of transformed β during cooling. The tensile properties and fracture toughness decrease by aging because of the precipitation of α2 when the cooling rate is greater like water quenching after solutionizing. The tensile strength, elongation, reduction of area and fracture toughness increase by aging when the cooling rate is smaller like air cooling after solutionizing because the transfored β is divided into smaller pieces although 0.2% proof stress decreases.

Original languageEnglish
Pages (from-to)628-634
Number of pages7
Journaljournal of japan institute of light metals
Volume44
Issue number11
DOIs
Publication statusPublished - 1994 Jan 1

Keywords

  • TiAl
  • fracture toughness
  • intermetallic compound
  • mechanical property
  • microstructure

ASJC Scopus subject areas

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

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