Abstract
The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti and Fe-28Al-4Ti (all compositions reported in this paper are in atomic percent) alloys has been investigated by tensile testing, optical microscopy and transmission electron microscopy. Tensile tests were performed at 700–900 °C under a strain rate range of about 10−5 − 10−2/s.The maximum strain rate sensitivity index m was found to be 0.5 and the largest elongation reached 620%. The flow activation energy was measured to be 263 kJmol for Fe-28Al and 191 KJmol for Fe-28Al-2Ti, which is much lower than the creep activation energy generally observed in Fe3Al alloys. After deformation, the grain size became much finer; from about 100 μm to 20–30 μm. As combined with TEM observations, we suggested that a continuous recrystallization process took place and superplasticity may arise from this process.
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