Hot Deformation Behavior of β-Solidifying TiAl Based Alloy |
| V.S. Sokolovskya, N.D. Stepanova, S.V. Zherebtsova, N.A. Nochovnayab, P.V. Paninb, G.A. Salishcheva
aBelgorod State University, 85 Pobeda Str., 308015, Belgorod, Russian Federation bFederal State Unitary Enterprise ``All-Russian Scientific Research Institute of Aviation Materials'', 17 Radio Str., 105005, Moscow, Russian Federation |
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| High-temperature mechanical behavior and microstructure evolution during hot deformation of an as-cast β-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° 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 α2+γ and α+γ phase fields were associated with dynamic recrystallization/spheroidization processes. Dynamic recrystallization was the controlling process of the microstructure evolution in the α and α+β 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. |
DOI:10.12693/APhysPolA.134.675 PACS numbers: 81.40.Lm, 81.40.Gh, 87.15.La |