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本文研究了大晶粒Ｆｅ_３Ａｌ基合金Ｆｅ—２８Ａｌ—２Ｔｉ合金的高温变形行为。发现该合金在７５０℃到９００℃应变速率为１×１０~（－３）／ｓ时以及在８５０℃一个较宽的应变速率范围内具有超塑性，最佳延伸率可超过５００％。８５０℃不同应变速率下，ｍ值可以从０．２２变化到０．４１金相及ＴＥＭ观察表明变形过程中发生了明显的动态再结晶，并由此导致了大晶粒Ｆｅ_３Ａｌ合金中的超塑性。
In this paper, the deformation behavior of large grain Fe-3Al-based Fe-28Al-2Ti alloy was investigated. The alloy was found to be superplastic at a strain rate of 1 × 10 -3 / s at 750 ° C to 900 ° C and over a wide strain rate range of 850 ° C with an optimum elongation of more than 500%. At different strain rates of 850 ℃, the value of m can change from 0.22 to 0.41. The metallographic and TEM observations indicate that significant dynamic recrystallization occurred during the deformation and resulted in the superplasticity in the large grain Fe 3 Al alloy .