Isothermal Deformation of Gamma Titanium Aluminide

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Conference Proceeding

Publication Date



Gamma titanium aluminide alloys are under consideration for automotive applications. In order to develop cost effective deformation processing technologies, limits of formability under different processing conditions need to be established. Alloys with compositions of Ti-(46.5-48) Al-2Nb-2Cr(a/o) prepared by different processing routes were used in this study. The grain sizes in these materials were in the range of 3 to 10,000 micrometers. Isothermal processing parameters such as strain rate, temperature, and total strain were varied in order to establish processing windows for uniform deformation of the different alloys. During isothermal forming, there exists a critical strain rate of 1s[-1] below which deformation occurred without the formation of macroscopic cracks. The lowest temperature for uniform deformation is influenced by the grain size and the final strain. The flow behavior of the different materials tested were typical of a material undergoing dynamic recrystallization. Microscopic examination revealed no micro-cracks and fine recrystallized grains in the deformed specimens.


Presented at a symposium sponsored by the Structural Materials Division (SMD) of TMS, held during the TMS '95 Annual Meeting, Las Vegas, NV.