Design of uniform nano a precipitates in alpha pre-deformed beta-Ti alloy with high mechanical performance

作者：Zhang, Bingjie; Yang, Tao; Huang, Mingda; Wang, Dong; Sun, Qiaoyan^*; Wang, Yunzhi^*; Sun, Jun

来源：Journal of Materials Research and Technology, 2019, 8(1): 777-787.

DOI：10.1016/j.jmrt.2018.06.006

• beta-Ti alloy
• Short-time aging saturation
• Uniform alpha precipitates
• Mechanical properties

A strategy for the microstructural design to achieve a critical upper limit of uniform nano alpha precipitates by controlling the amount of dislocations in the pre-deformed matrix after short time aging treatment was proposed in Ti-10Mo-8V-1Fe-3.5Al (all in wt.%, TB3 alloy) beta alloy. The optimal processes focused on the interaction of defects, mainly point defects and dislocations that are generated during cold rolling (CR). Texture evolution of alpha and beta phases was also specified. Amount of nano-scaled alpha precipitates was characterized by the number density of precipitates observed by SEM, which is saturated at similar to 204.1 mu m(-2). For the CR 20% sample, a good combination of tensile strength (similar to 1400 MPa) and elongation (similar to 12%) was achieved after secondary aging at 550 for 1 h, which provides an enlightenment for the re-engineering of traditional precipitate-hardening alloys.

• 出版日期2019-3
• 单位西安交通大学