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研究了 Ｆｅ－２８Ａｌ－５Ｃｒ（原子分数）与 Ｆｅ－２８Ａｌ－５Ｃｒ－０．５Ｎｂ－０．１Ｃ合金的高温变形行为，结果表明，在 ８５０ ℃左右，应变速率为 ８．３×１０－４ ｓ－１时，呈现一定的超塑性变形能力，延伸率分别达到 １４５％和 ２５４％；应变速率敏感指数 ｍ分别为 ０．４与 ０．３５；激活能分别为： ２４３ ｋＪ／ｍｏｌ与 ２１８ ｋＪ／ｍｏｌ．在变形过程中，位错堆积形成小角度晶界，并逐渐转变成大角度晶界，使粗大的原始晶粒细化．
The high-temperature deformation behavior of Fe-28Al-5Cr (atomic fraction) and Fe-28Al-5Cr-0.5Nb-0.1C alloy was studied. The results show that the strain rate is about 8.3 × 10-4 s -1, a certain degree of superplastic deformation was obtained with elongation rates of 145% and 254% respectively. The strain rate sensitivity indices m were 0.4 and 0.35, respectively. The activation energies were 243 kJ / mol and 218 kJ / mol. In the deformation process, the dislocations form a small angle grain boundary, and gradually transformed into large-angle grain boundaries, the coarse original grain refinement.