| Abstract Scope |
The Ta-10W alloy, characterized by a body-centered cubic (BCC) crystal structure, is a refractory metal that exhibits excellent chemical stability and high ductility. In this study, 5mm thick Ta-10W alloy plates were subjected to rolling using a four-high rolling mill at reduction ratios of 20%, 40%, 60%, and 80% under both room temperature rolling (RTR) and cryogenic rolling (CR) conditions. Subsequently, the room temperature and cryogenically rolled Ta-10W alloy sheets were annealed in a high vacuum furnace at temperatures ranging from 1200℃ to 1500℃ in 100℃ intervals for one hour. Experimentally, electron backscatter diffraction (EBSD) was employed to observe the deformation microstructure of the room temperature and cryogenically rolled Ta-10W alloys, as well as the recrystallized microstructure after annealing. The stored energy (SE), kernel average misorientation (KAM), and geometrically necessary dislocations (GND) maps of the Ta-10W alloy were compared and analyzed according to the rolling temperature to understand the deformation behavior. Additionally, Vickers hardness (HV) and grain orientation spread (GOS) distributions were analyzed to investigate the recrystallization behavior with respect to the annealing temperature, thereby comparing the recrystallization temperature and recrystallization fraction. Theoretically, crystal plasticity finite element method (CPFEM) was utilized to analyze the effects of reduction ratios and rolling temperatures on the initial recrystallization of the Ta-10W alloy. CPFEM analysis provided insights into the stored energy, Taylor factor, and slip activity of the main texture components developed during cold rolling. Furthermore, the Monte Carlo method was employed to model the differences in deformation microstructure, crystallographic orientation, and slip behavior according to the reduction ratios and rolling temperatures, and their effects on the initial recrystallization during annealing were compared and analyzed with the experimental results. |