Primary α phase microstructure of Ti62A titanium alloy solution treated at 910 ℃ for different time was characterized by means of OM,SEM and EBSD techniques,to investigate the evolution characteristics of the primary α phase and the spheroidization mechanism during the solid solution process.The results show that the initial microstructure of the forged Ti62A titanium alloy consists of the primary α phase,lamellar α phase and residual β phase.During the solid solution process at 910 ℃,the lamellar α phase dissolves rapidly,and the volume fraction of primary α phase first decreases and then remains unchanged with the increase of solution time,but the axis/diameter ratio is basically maintained at about 2.1.During the solution treatment,a large misorientation appeares inside the grains of the primary α phase,producing α/α grain boundaries with different orientations.With the growth of solution time,the grain is prone to grain boundary separation and the formation of new equiaxed primary α phase when the misorientation of α/α grain boundaries within the long strip primary α phase is greater than 10°.
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