Abstract
In this study, 2.5 vol% TiBw /Ti composites were subjected to isothermal multi-directional forging (IMDF) at 1020 °C with various strain rates, aimed to investigate the spheroidization behavior of TiBw /Ti composites with initial widmanstatten microstructure. It is found that strain rate has a significant effect on the spheroidization of microstructure. Dynamic recovery (DRV) of α phase occurs at high strain rate while dynamic recrystallization (DRX) dominates microstructure spheroidization with the decreasing of strain rate. It is worth noting that α lamella and α colony exhibit different spheroidization behavior, which leads to the heterogeneity of microstructure. Moreover, the relationship between crystallographic orientation and imposed strain play an important role in the spheroidization process. The schmid factor calculated by EBSD was used to identify and predict heterogeneous deformation phenomena of α colony. The spheroidization process can be promoted by TiB whiskers due to the introduction of large deformation in the matrix.
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