X-ray elastic constant determination and residual stress of
two phase TiAl-based intermetallic alloy
two phase TiAl-based intermetallic alloy
(1. LM3 ESA CNRS 8006, ENSAM, 151 Bd. del'H[AKo^D〗pital Paris 75013, France；
2. Department of Materials Science and Engineering,
Beijing University of Aeronautics and Astronautics, Beijing 100083, P.R.China)
2. Department of Materials Science and Engineering,
Beijing University of Aeronautics and Astronautics, Beijing 100083, P.R.China)
Abstract: To evaluate the residual stress in TiAlbased alloys by X-ray diffraction, X-ray elastic constants (REC) of a γ-TiAl alloy were determined. From these results, the stress state of a given phase in a duplex TiAl-based alloy under a uniaxial tensile loading has been characterized by X-ray diffraction. The results show that the X-ray elastic constants and the microscopic stresses of the given phase are different from the apparent elastic constants and the macroscopic stresses of the alloy. The reason of the different distribution of the alloy was also discussed.
Key words: TiAl-based alloy; X-ray diffraction technique; X-ray elastic constant; duplex structure residual stress