SHAN Aidang;LIN Dongliang; CHEN Mingwei; LI Dingqiang(Shanghai Jiaotong Universitty; Shanghai 200030)(Manuscript received. 94-05-12). SUPERPLASTICITY IN Fe_3Al ALLOY WITH LARGE GRAINS. Acta Metall Sin, 1995, 31(13): 35-39.
Abstract High temperature deformation behaviour of Fe-28Al-2Ti alloy with large grains was examined. This alloy showed superplasticity in the temperature range of 750℃ to 900℃ under a strain rate of 1 × 10~(-3)/ s and maintained superplastic it at 850℃ in a relatively wide range of strain rate. The highest m value may exceed 500%. At 850℃ . m value changes from 0.22 to 0.41 under different strain rates. Optical and TEM observations revealed that a dynamic recrystallization process took place with the deformation process and this in turn resulted in the superplasticity in this alloy with large grains Correspondent: LIN Dongliang,professor , Department of Materials Science, Shanghai Jiaotong University,Shanghai 200030