Abstract
This study aimed to elucidate the deformation mechanism during low-temperature superplasticity of fine-grained Ti-6Al-2Sn-4Zr-2Mo-0.1Si alloy in the context of constitutive equation. For this purpose, initial coarse equiaxed microstructure was refined to <TEX>$2.2{\mu}m$</TEX> via dynamic globularization. Globularized microstructure exhibited large superplastic elongations(434-826%) at temperatures of <TEX>$650-750^{\circ}C$</TEX> and strain rate of <TEX>$10^{-4}s^{-1}$</TEX>. It was found that the main deformation mechanism of fine-grained material was grain boundary sliding accommodated by dislocation motion with both stress exponent (n) and grain size exponent (p) values of 2. When the alpha grain size, not sub-grain size, was considered to be an effective grain size, the apparent activation energy for low-temperature superplasticity of the present alloy(169kJ/mol) was closed to that of Ti-6Al-4V alloy(160kJ/mol).
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