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High-temperature mechanical behavior and microstructure evolution during hot deformation of an as-cast beta-solidified Ti-44Al-2V-1Nb-1Zr-0.2Gd-0.2B alloy were studied. The as-cast alloy was subjected to uniaxial compression at temperatures from 1100 to 1250 degrees C and strain rates in the range 0.001-1 s(-1). Different mechanisms of microstructure evolution were found to operate depending on deformation temperature and phase fields. Transformation of the initial lamellar microstructure into globular one in the alpha(2) + gamma and alpha + gamma phase fields were associated with dynamic recrystallization/spheroidization processes. Dynamic recrystallization was the controlling process of the microstructure evolution in the alpha and alpha+beta phase fields. Deformation in all phase fields resulted in microstructure refinement which, in turn, induced superplasticity under certain temperature-strain rate conditions. The relationships between mechanical behavior and microstructure after deformation were discussed.

Hot Deformation Behavior of β-Solidifying TiAl Based Alloy