SUPERPLASTICITY IN LARGE-GRAINED Fe_3Al ALLOYS

Abstract

Abstract: The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti, Fe-28Al-4Ti (all composition reported in this paper are in atomic percent) alloys has been investigated by tensile testing.optical microscopy and transmission electron mocroscopy.Tensile test were performed at 700 to 900℃ under a strain rate range of about 10-5/s to 10-2/s. 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 263kJ/mol for Fe-28Al and 191kJ/ mol for Fe-28Al-2Ti, which are much lower than the creep activation energy generally observed in Fe3Al alloys. After deformation grain size became much finer from about 100 μm to 20-30μm.As combined with TEM observations, we suggested that a continuous recrystallization process took place and superplasticity may arise from this process.

Key words: superplasticity, Fe_3Al alloy, large grains

LIN Dongliang(T. L. Lin),(SHAN Aidang, CHEN Mingwei Shanghai Jiaotong University, Shanghai 200030, China). SUPERPLASTICITY IN LARGE-GRAINED Fe_3Al ALLOYS[J]. Acta Metallurgica Sinica (English Letters), 1995, 8(z1): 419-429.

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SUPERPLASTICITY IN LARGE-GRAINED Fe_3Al ALLOYS

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