Metallurgical Transactions A

, Volume 6, Issue 11, pp 1991–1996

The deformation and fracture of TiAl at elevated temperatures

Authors

  • Harry A. Lipsitt
    • Processing and High Temperature Materials Branch, Metals and Ceramics Division, Air Force Materials LaboratoryWright-Patterson Air Force Base
  • Dan Shechtman
    • Processing and High Temperature Materials Branch, Metals and Ceramics Division, Air Force Materials LaboratoryWright-Patterson Air Force Base
  • Robert E. Schafrik
    • Processing and High Temperature Materials Branch, Metals and Ceramics Division, Air Force Materials LaboratoryWright-Patterson Air Force Base
Mechanical Behavior

DOI: 10.1007/BF03161822

Cite this article as:
Lipsitt, H.A., Shechtman, D. & Schafrik, R.E. MTA (1975) 6: 1991. doi:10.1007/BF03161822

Abstract

The tensile properties of the intermetallic compound TiAl have been determined at several temperatures in the range 25 to 1000°C. Additional variables studied were the influence of strain rate and the effect of exposure to oxidizing conditions prior to testing. The modes of deformation under the various testing conditions were studied in the electron microscope, the modes of fracture were studied in the scanning electron microscope, and these data were correlated with the mechanical properties. The results indicate that the ductilebrittle transition behavior of TiAl at about 700°C is controlled by the trailinga/6 [112] partial dislocation components of thea [011] superdislocations overcoming their pinning barriers. It was also shown that prior exposure to oxidizing conditions does not markedly influence the mechanical properties of TiAl.

Copyright information

© The Minerals, Metals & Materials Society - ASM International - The Materials Information Society 1975