The new β-titanium base five-element alloy is characterized in that the alloy is composed of Ti, Zr, Nb, V, Al five elements, according to the weight percentage: Zr: 15%-25%, Nb: 15%-20%, V: 2%-6%, Al: 0.5%-2%, the margin is titanium. Compared with the existing Ti-Zr-Nb series alloys, the alloy reduces the Nb element, and aluminum and vanadium elements are added in the form of aluminum vanadium alloy, so the alloy cost is lower. The β titanium alloy is smelted by vacuum arc melting furnace, and the materials in the form of plate and rod wire are prepared by cold or hot processing and heat treatment. The β titanium alloy material has low modulus, high elasticity, excellent cold workability and weldability. The β titanium alloy has higher cost performance. Can be directly applied to dental materials, elastic materials. Can also be welded in the form of components, alone or together with Ti-6Al-4V titanium alloy applied to eyewear materials, sporting goods materials and other elastic components.
On the basis of Ti-Zr-Nb series alloy, the composition of titanium alloy is adjusted, precious metal elements are reduced, and cheap aluminum vanadium alloy elements are added, so that the new five-element alloy still maintains low modulus, high elasticity, excellent cold workability and welding performance. The characteristic of the new titanium alloy is that the alloy is mainly composed of Ti, Zr, Nb, V, Al five elements, according to the weight percentage: Zr: 15%-25%, Nb: 15%-20%, V: 2%-6%, Al: 0.5%-2%.
The reason for the design of these alloys is that various alloying elements have different stabilizing and strengthening effects on the β phase of titanium alloy. Compared with α phase, β phase has larger atomic spacing, weaker interatomic attraction and lower elastic modulus. Moreover, the slip system of β phase is more, and the machinability of corresponding alloy materials is better. A beta titanium alloy was designed. Similarly, in order to achieve the purpose of low elastic modulus, the strengthening effect of selected alloy elements should be weak.
zirconium and titanium form α and β continuous solid solutions, Nb and V form β continuous solid solutions with titanium, Al and titanium do not form continuous solid solutions. Therefore, the content of Al element is minimum in the design alloy element, so as to avoid the formation of Ti-Al intermetallic compound. Zr is a neutral element. When Zr content is higher than 18%, a small amount of β phase can be preserved in titanium alloy only after rapid cooling. Moreover, Zr is a weakly alloyed element with a similar atomic radius to Ti. Therefore, the α -- β transition temperature of titanium decreases sharply due to the high content of Zr, Nb and V in the designed alloys, which belong to weak β stable elements. When the content of Nb is higher than 36%, the β phase can be preserved completely. When the V content is higher than 15%, the β phase can be completely preserved. The main effects of Nb and V on the properties are different. Nb mainly improves the plasticity of titanium alloy, while V mainly improves the strength of titanium alloy. Therefore, in the design alloy elements, the content of Nb element is high and the content of V element is low.
