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论文题目： The microstructure evolution history and the underlying mechanism of an α/β dual phase titanium alloy during elastic-plastic deformation process

发表时间：Available online 25 September 2021

刊源：Materials Science & Engineering A 828 (2021) 142106 [ 点击下载PDF ]

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In the macroscopic elastic deformation stage, the microstructure with 0% and 1% macroscopic deformation in the viewing zone characterized by EBSD is shown in Fig. 5. Fig. 5(a), (b) and (c) are the image quality (IQ), inverse pole figures (IPF) of α phase and β phase in the normal direction (ND) of the specimen with 0% macroscopic deformation, and Fig. 5(d), (e) and (f) are the IQ and IPF of α phase and β phase in the ND of the specimen with 1% macroscopic deformation. In the present study, the loading direction is parallel to the horizontal direction. It can be seen by comparing Fig. 5(c) and (d) that with the macroscopic deformation increase from 0% to 1%, much noise appears in IPF due to the increase of localized strain, but the noise does not affect the analysis of deformation process of the titanium alloy. Combined the IQ with IPF in Fig. 5, the microstructure of different regions in the viewing zone is observed. No. 1 and No. 2 are the equiaxed α_p with single orientation inside the grains, No. 3 and No. 4 are the equiaxed α_p with large orientation change inside the grains, No. 5 is the equiaxed α_p with small orientation change inside the grain, No. 6 and No. 7 are the β_T regions separated by acicular α_s, and No. 8 is the intersection α_p.

Fig. 5. The microstructure with the macroscopic deformation of 0% and 1% characterized via EBSD. (a) IQ, (b) IPF of α phase and (c) IPF of β phase in the ND of the specimen with 0% macroscopic deformation, (d) IQ, (e) IPF of α phase and (f) IPF of β phase in the ND of the specimen with 1% macroscopic deformation.

In this section, the macroscopic deformation of the specimen in section 3.2.1 is further increased to 2%, and the microstructure characterized by EBSD is shown in Fig. 13. Fig. 13(a) indicates the IQ, and Fig. 13(b) and (c) are the corresponding IPF of α and β phases in the ND of the specimen, respectively. The differences of the microstructure with 1% and 2% macroscopic deformation can not be revealed outstandingly just by comparing IQ and IPF shown in Figs. 5 and 13. Thus, the high magnification views of local regions in the microstructure characterized via EBSD are needed to analyze the deformation process.

Fig. 13. The microstructure with the macroscopic deformation of 2% characterized via EBSD. (a) IQ, (b) IPF of α phase and (c) IPF of β phase.

Fig. 18 exhibits the microstructure with 10% macroscopic deformation characterized by EBSD. Fig. 18(a) indicates the IQ, and Fig. 18(b) and (c) are the corresponding IPF of α and β phases in the ND of the specimen, respectively. The differences of the microstructure with 2% and 10% macroscopic deformation can not be revealed outstandingly just by comparing IQ and IPF shown in Figs. 13 and 18. Thus, the high magnification views of local regions in the microstructure characterized via EBSD is needed to analyze the deformation process.

Fig. 18. The microstructure with the macroscopic deformation of 10% characterized via EBSD. (a) IQ, (b) IPF of α phase and (c) IPF of β phase.