Abstract
The effect of TiB particles on the β recrystallization behavior of an as-cast Ti-2Al-9.2Mo-2Fe-0.1B (hereafter 2A2F10B) metastable β titanium alloy was investigated during hot rolling with a related β solution treatment. The microstructure evolution was analyzed based on the electron backscatter diffraction (EBSD). The particle-stimulated nucleation (PSN) behavior of the TiB particles occurred naturally in the dynamic recrystallization during hot rolling and in the static recrystallization during the β solution treatment, which effectively promoted the recrystallization of 2A2F10B under the studied conditions. The PSN mechanism caused recrystallized grains with different orientations to nucleate around single TiB particles by random lattice rotation, which led to a weak texture in the recrystallized microstructure. The complete recrystallization of the as-cast 2A2F10B alloy could be achieved, and it had a fine microstructure after single-heating hot rolling, with a reduction of at least 65%, along with the related β solution treatment.
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