Boron modified O phase-based titanium alloy with new phase constitution and reduced Nb content.

(Oα_2)型O相基Ti-27。5Al-13Nb是一种新型的轻质高强度钛金属间化合物合金。在本研究中，对成分进行了修改以降低Nb含量，以及三种衍生合金，Ti-27。5AL-8。7Nb-1Mo，钛-27。5AL-5。5 Nb-1Fe和Ti-27。5AL-4。9Nb-1mo-0。5Fe，均为新设计。在(B-α-2)两相区添加少量的B和进行形变处理，可以有效地细化其组织，从而改善其塑性。在这些合金中，钛-27就是。5AL-8。7Nb-1mo-0。1B合金在800℃以下的整个温度范围内表现出最高的抗拉强度和塑性，因此是一种最有前途的高温合金。

The(O+α2)-type O phase-based Ti-27. 5Al-13Nb is a new type of lightweight and high-strength titanium intermetallic alloy. In the present study, the composition was modified to reduce the Nb content, and three derivative alloys, Ti-27. 5Al-8. 7Nb-1Mo, Ti-27. 5Al-5. 5 Nb-1Fe and Ti-27. 5Al-4. 9Nb-1Mo-0. 5Fe, were newly designed. A minor addition of boron(B) and a thermo-mechanical treatment in the(B+α2) two-phase region were found to be effective in refining their microstructures and thus in improving their ductility. Among these alloys, the Ti-27. 5Al-8. 7 Nb-1Mo-0. 1B alloy showed the highest tensile strength and ductility in the whole temperature range up to 800°C, and thus turned out to be a most promising alloy for high temperature applications.