Technology and mechanical properties of advanced γ-TiAl based alloys

Wilfried Wallgram*, Thomas Schmölzer, Limei Cha, Gopal Das, Volker Güther, Helmut Clemens

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

119 Scopus citations

Abstract

The present paper summarizes our progress in establishing a novel production technology for γ-TiAl components to be used in advanced aircraft engines. In the beginning the main emphasis is put on the design of a γ-TiAl based alloy which exhibits excellent hot-workability. Then, the development of a "near conventional" hot-die forging route for this type of intermetallic material is described. Finally, the effect of twostep heat-treatments on the microstructure and the mechanical properties is discussed. Because of the small "deformation window" hot-working of γ-TiAl alloys is a complex and difficult task and, therefore, isothermal forming processes are favoured. In order to increase the deformation window a novel Nb and Mo containing γ-TiAl based alloy (TNM™ alloy) was developed, which solidifies via the b-phase and exhibits an adjustable β/B2-phase volume fraction. Due to high volume fractions of β-phase at elevated temperatures the alloy can be hot-die forged under near conventional conditions, which means that conventional forging equipment with minor and inexpensive modifications can be used. Examples for the fabrication of γ-TiAl components employing a near conventional forging route are given. With subsequent heat-treatments balanced mechanical properties can be achieved. The results of tensile and creep tests conducted on forged and subsequently heat-treated TNM™ material are presented.

Original languageEnglish
Pages (from-to)1021-1030
Number of pages10
JournalInternational Journal of Materials Research
Volume100
Issue number8
DOIs
StatePublished - 2009

Keywords

  • Intermetallics
  • Mechanical properties
  • Microstructure
  • Processing
  • TiAl alloys

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