1.School of Mechanical Engineering and Rail Transit,Changzhou University;2.School of Materials Science and Engineering,Anhui University of Technology
V-5 (Al-5Ti-1B) alloys (V-5ATB) were prepared by in vacuum electric arc melter. The effects of solution treatment temperature and time on the microstructure, hardness and rollability of V-5ATB alloys were studied by optical microscope, X-ray diffractometer, hardness testing and rollability testing technology. The results showed that, when V-5ATB alloys were solution treated at 800 and 900 ℃, TiB phases gradually dissolved into V–based solid solution (Vss) and the grains grew with the increasing temperature. The strengthening effect of TiB second phase and fine grains of the alloys is weakened more than the increase of solid solution strengthening effect, resulting in the hardness decrease of the alloys with the increasing temperature. When the alloys were solution treated at 1000 ℃, the TiB phases in the alloys were almost completely dissolved into Vss, and the solid solution strengthening effect is dominant, resulting in the hardness increase of the alloys. When V-5ATB alloys were solution treated at 900 ℃, TiB phases gradually dissolves into Vss and the grains grew with time. The weakening degree of the strengthening effect of the second phase and fine grain of the alloys is greater than the increase degree of the solid solution strengthening effect, resulting in the hardness decrease of the alloys after solution treatment with the extension of time. The optimum solution treatment parameter of V-5ATB alloys is 900 ℃/2 h. The rollability of the solution treated V-5ATB alloys is improved by about 24% compared with those of the as-cast alloys.
[Jiang Peng, Liu Dawen, Liu Hui, Ren Wenyue, Huang Huanchao, Wu Wangping, Song Guangsheng, Zhang Yi. Effect of heat treatment on microstructure, hardness and rollability of V-5 (Al-5Ti-1B) alloys for hydrogen separation[J]. Rare Metal Materials and Engineering,2023,52(1):261~266.]