Densification mechanism of Ti-1Al-8V-5Fe alloy by spark plasma sintering
LI Wenjie, ZENG Fanhao, LI Lei, WANG Ziwei, LIU Honghao, PENG Yirui, GU Yi
National Key Laboratory of Science and Technology for National Defence on High-Strength Structural Materials, Central South University, Changsha 410083, China
Abstract：TiH2, FeV80, Al and Fe powders were used as raw materials, and the spark plasma sintering was used to prepare Ti-1Al-8V-5Fe (Ti185) alloys at 800-1 200 ℃ for 10min. The effective stress exponent (n) and the densification activation energy (Qd) were evaluated by the sintering densification curve and mature creep model, which were used to study the densification kinetics of Ti185 alloys. The results showed that the alloys were rapidly densified without obvious grain growth at low temperature (800-1 000 ℃). When sintering temperature reached 1 100 ℃, the alloys were slowly densified with obvious grain growth. During sintering at 800-1 000 ℃, the densification stage in the early stage of dwelling had low effective stress exponent n and apparent activation energy Qd(n=1, Qd=52 kJ/mol), which was the stage of low effective stress, and grain boundary diffusion controlled the densification process of alloys. However, the later stage of dwelling corresponded to a higher effective stress stage, with n=3 and Qd=175.7 kJ/mol. The densification mechanism of the alloys was controlled by dislocation climbing.
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2020, Vol. 25 
