【摘 要】
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The microstructure and hot tensile behaviors of the different heat-treated Ti2AlNb sheets were investigated by backscattered electron image (BSE),electron backs
【机 构】
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College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics
论文部分内容阅读
The microstructure and hot tensile behaviors of the different heat-treated Ti2AlNb sheets were investigated by backscattered electron image (BSE),electron backscattering diffraction (EBSD),transmission electron microscope (TEM) and tensile tests.The grain sizes andcontents of α2,B2/β and O phases were quantitatively studied.As the heating time increases at 970 ℃,the mean grain size and content of α2-phase increased.The grain shapes and distributions of the O-phase lamellar grains were affected by the heat treatments.The plastic deformation promoted the O → B2/β phase transition and the globularization of O-phase lamellar grains at 970 ℃.Calculated by the creep equation and the iso-stress method,the grain size exponent was μ =1.1 and the relationship between the material constants of B2/β and O phase was Ko =1.14KB2/β.
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