-4、5.0×10-4、1×10-3、2×10-3、4×10-3、1×10-2和5×10-2 s-1，并對不同變形溫度下的試樣組織進行了表征。通過實驗結(jié)果，確定了本構(gòu)模型的材料常數(shù)；α2+B2/β+O三相區(qū)（1203~1243 K）和α2+B2兩相區(qū)（1243~1283 K）的拉伸變形激活能分別為845 165和412 779 J/mol。構(gòu)建了Arrhenius本構(gòu)模型來描述Ti-22Al-25Nb合金在不同溫度下的拉伸變形行為。;Isothermal uniaxial tension tests for O phase-based Ti-22Al-25Nb alloys were conducted at 1203–1283 K with temperature interval of 20 K. The strain rates were 2.5×10-4, 5.0×10-4, 1×10-3, 2×10-3, 4×10-3, 1×10-2, and 5×10-2 s-1. The microstructures of specimens at different deformation temperatures were characterized. Through the experiment results, the material constants for the constitutive models are determined and the tensile deformation activation energies are 845 165 and 412 779 J/mol at α2+B2/β+O three-phase region (1203–1243 K) and α2+B2 two-phase region (1243–1283 K), respectively. Arrhenius-type constitutive models are constructed to characterize the tensile deformation behavior of Ti-22Al-25Nb alloy at different temperatures."/>
2AlNb;本構(gòu)模型;微觀組織;變形行為;Ti2AlNb;constitutive model;microstructure;deformation behavior"/>