Beta phase stability of Ti-35Nb-6Ta-7Zr-0.7O beta titanium alloy

5th International Conference Recent Trends in Structural Materials

Preisler, D.^1 ; Stráský, J.^1 ; Bartha, K.^1 ; Dugan, J.^2 ; Janeek, M.^1

Department of Physics of Materials, Charles University, Ke Karlovu 5, Praha 2, Czech Republic^1

COMTES FHT, A.S., Prmyslová 995, Dobany, Czech Republic^2

关键词: Alpha phase;    Annealing treatments;    Beta phase stabilities;    Beta titanium alloy;    Micro-structural observations;    Microhardness measurement;    Solution treated conditions;    Thermo-mechanical processing;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/461/1/012068/pdf
DOI  :  10.1088/1757-899X/461/1/012068

来源: IOP

【 摘 要 】

Phase stability of metastable beta Ti alloy Ti-35Nb-6Ta-7Zr-0.7O (wt.%) in a beta solution treated condition was studied during annealing at 400°C - 700°C for 1 h - 16 h. Resulting micro structure was characterized by scanning electron microscopy; the samples were also characterized by microhardness measurements. The microhardness did not change in any of the annealed condition. The reason follows from the microstructural observations, the α phase precipitation did occur only at the grain boundaries and only at higher temperatures / longer annealing times. Thus, the β phase stability is high and this fact can be used for designing annealing treatments or the thermo-mechanical processing route.