The evolution characterization of the α/β interphase boundaries of the isothermally compressed Ti-5Al-2Sn-2Zr-4Mo-4Cr with lamellar microstructure was carried out via electron backscatter diffraction(EBSD)and transmission electron microscope(TEM).The effect of the α/β interphase boundary evolution on the dynamic globularization was discussed,and the nucleation model for the β recrystallized grain at the cusp of αlath in the late stage of deformation in terms of the classic nucleation theory was established.The mean α/βinterface deviation angle from Burgers orientation relationship(BOR)increased continuously up to 18.9° with the increasing strain from 0.1 to 0.5,which was dominated by the continuous dynamic recrystallization.Restoration of BOR between α and β phases at the strains of 0.7 and 0.9 occurred due to the occurrence of recrystallized α andβ grains following BOR,which was rationalized by a nucleation model considering the stored energy of defor-mation provided the driving force for nucleation at the cusp of α lath.Loss of coherency of α/β interphase boundaries at a strain about 0.3 was responsible for accelerating the dynamic globularization of α lamellae since the energy of α/β interphase boundaries increased up to the maximum value when the non-coherent α/β inter-phase boundaries were formed.Restoration of coherency of α/β interphase boundaries due to the recrystallization nucleation in the late stage of deformation did not substantially affect the dynamic globularization since the α/αintraphase high-angle boundaries(HAGBs)were formed and the most α/β interphase boundaries were non-coherent.

Lian Li;Miaoquan Li

School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an,710072,PR China

自然科学进展·国际材料（英文）

[1]Lian Li;Miaoquan Li-.Further mechanism of α/β interphase boundary evolution and dynamic globularization of Ti-5Al-2Sn-2Zr-4Mo-4Cr at elevated temperature deformation)[J].自然科学进展·国际材料（英文）,2022(04):490-497

intraphase

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