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论文题目： Plastic deformation mode and α/β slip transfer of Tie5Al-2.5Cr-0.5Fe-4.5Moe1Sne2Zre3Zn titanium alloy at room temperature

发表时间：Available online 6 February 2020

刊源：Journal of Alloys and Compounds 826 (2020) 154209 [ 点击下载PDF ]

 研究文献内容展示

In the early stage of tensile deformation (Fig. 5a), the post-deformation morphology differed only slightly from the pre-deformation morphology. However, the crystal orientation changed with sub-grain boundary migration and substructure formation. The density of sub-grain boundaries increased significantly as the deformation progressed (Fig. 5b). In the later stage of deformation (Fig. 5c and d), the microstructure changed considerably (compared with the microstructure in the early stage), owing to the generation and migration of new grain boundaries and sub-grain boundaries.

Fig.5. OIM of the observed region with different strain.

Several features of slip activity and slip transfer could be summarized as follows: (1) Compared with other slip systems, prismatic slip systems could be activated (e.g., by the slip transfer) with a lower Schmid factor. (2) The crystal orientation changed during deformation, and adjacent grains under coalescence or splitting adapted to the overall deformation. (3) Slip transfer was partially blocked due to a large misorientation angle, and occurred with a very large misorientation angle resulting from high Schmid factors for the incoming or outgoing slip.

Fig.11. Slip activation and slip transfer in a specific region: (a) 4% strain, morphology and phase distribution, (b) 4% strain, Euler angle distribution, (c) 7.8% strain, morphology and phase distribution, (d) 7.8% strain, Euler angle distribution.

The phase maps corresponding to the material before deformation (Fig. 13a) and at a strain level of 15.5% (Fig. 13b), which reveals the distribution of a phase (red) and b phase (blue), are compared. It can be seen that the white areas, (i.e., the severely deformed areas, which lack orientation data) were mainly located between a phase and b phase. It can partly supported the above conclusion that the severe deformation tends to occur between two phases during compatible deformation.

Fig. 13. Phase map of the observed region: (a) without deformation, (b) with 15.5% strain.