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在温度９７３～１３７３Ｋ、形变速率２×１０－５～１．５×１０－１ｓ－１的试验条件下，研究了Ｆｅ－５Ｎ合金奥氏体的高温拉伸变形行为．结果表明：高温变形时峰值应力σｐ与温度Ｔ和形变速ε之间符合下式关系：Ｚ＝εｅｘｐ（Ｑ／ＲＴ）＝Ａ（ｓｉｎｈ（ａσｐ））ｍ。高应变速率区的表观激活能Ｑ为３１４ｋＪ／ｍｏｌ，与Ｆｅ的自扩散激活能Ｑｓｄ相当，变形由空位扩散所控制；而低应变速率区的Ｑ为２０２ｋＪ／ｍｏｌ，约为Ｑｓｄ的２／３，变形由晶界滑移所控制．
The high temperature tensile deformation behavior of austenite in Fe-5N alloy was investigated at a temperature of 973 ~ 1373K and a deformation rate of 2 × 10-5 ~ 1.5 × 10-1s-1. The results show that the relationship between the peak stress σp and the temperature T and the deformation velocity ε is as follows: Z = εexp (Q / RT) = A (sinh (aσp)) m. The apparent activation energy Q in the high strain rate region is 314 kJ / mol, which is equivalent to the self-diffusion activation energy Qsd of Fe and controlled by the vacancy diffusion. The Q of low strain rate region is 202 kJ / mol, which is about 2 / 3, deformation controlled by grain boundary slip.