The deformation and fracture of Ti3Al at elevated temperatures

  • Harry A. Lipsitt
  • Dan Shechtman
  • Robert E. Schafrik
Mechanical Behavior

Abstract

The tensile properties of the intermetallic compound Ti3Al have been determined in air at several temperatures within the range of 25 to 900 °C. The dislocation structures produced by the various testing conditions were studied in the electron microscope and the fracture modes were studied in the scanning electron microscope. These microstructural observations were correlated with the mechanical properties. The results indicate that Ti3Al has only limited ductility even at 900 °C. The apparent ductile-brittle transition which occurs above 600 °C is due to increasing amounts of intergranular cracking. Some increase in ductility above 600 °C is due to the onset of dislocation cross slipping. The fracture mode up to 600 °C is entirely cleavage. Above 600 °C the fracture shows increasing evidence of plasticity; however, cleavage remains the main fracture mode up to 900 °C.

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Copyright information

© American society for metals and the metallurgical society of AIME 1980

Authors and Affiliations

  • Harry A. Lipsitt
    • 1
  • Dan Shechtman
    • 2
  • Robert E. Schafrik
    • 3
  1. 1.Processing and High Temperature Materials Branch, Metals and Ceramics Division, Materials LaboratoryAir Force Wright Aeronautical LaboratoriesWright-Patterson AFB
  2. 2.Department of Materials EngineeringTechnionIsrael
  3. 3.Computer Integrated Manufacturing Branch, Manufacturing Technology Division, Materials LaboratoryAir Force Wright Aeronautical LaboratoriesWright-Patterson AFB

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