@misc{hua_hot_deformation_2019, 
author={Hua, K., Zhang, Y., Gan, W., Kou, H., Beausir, B., Li, J., Esling, C.},
title={Hot deformation behavior originated from dislocation activity and β to α phase transformation in a metastable β titanium alloy},
year={2019},
howpublished = {journal article},
doi = {https://doi.org/10.1016/j.ijplas.2019.03.011},
abstract = {Profound and comprehensive knowledge on hot deformation of metastable β titanium alloy is essential to process optimization and microstructure control. In this work, the hot compression behavior of a β quenched metastable β titanium alloy is thoroughly studied by examining microstructural evolution to resolve the related deformation mechanisms. It is demonstrated that the deformation of the alloy presents three characteristic stress-strain stages: a linear stage (Stage I), a discontinuous yielding (Stage II) and a steady-state (Stage III). Before and during Stage I, the β to α phase transformation happened intensively along the β grain boundaries with more than 90% of the boundaries occupied by grain boundaries α (αGB). The linear behavior deviates from the Young's modulus when the linear deformation proceeds to the late stage, indicating the onset of plastic deformation. This behavior results from dislocation slip near β grain boundary regions. The discontinuous yielding of Stage II is originated from the fragmentation of the αGB and the intensive formation of mobile dislocations near the β grain boundary areas. The steady-state of Stage III arises from two orientation dependent deformation modes of the β grains. For those in favorable activation orientation for their {110}β<11>β systems with respect to the external compressive load (type I), the deformation is realized by the dislocation slip and by the formation of slip bands; whereas for those with their {1}β<1>β systems - the major lattice deformation for structure change from β to α - in favorable activation orientations (type II), the deformation is achieved by intensive phase transformation by forming intragranular α precipitates. The present results provide new information on hot deformation mechanisms of metastable β titanium alloys, especially the phase transformation associated lattice deformation as an important plastic deformation mode.},
note = {Online available at: \url{https://doi.org/10.1016/j.ijplas.2019.03.011} (DOI). Hua, K.; Zhang, Y.; Gan, W.; Kou, H.; Beausir, B.; Li, J.; Esling, C.: Hot deformation behavior originated from dislocation activity and β to α phase transformation in a metastable β titanium alloy. International Journal of Plasticity. 2019. vol. 119, 200-214. DOI: 10.1016/j.ijplas.2019.03.011}}