High-strength high-ductility titanium alloy

Abstract

The invention relates to a high-strength high-tenacity titanium alloy, which is mainly used for manufacturing forged parts in structures of an airframe, airfoils and an undercarriage of an airplane. The high-strength high-tenacity titanium alloy is characterized in that the compositions of each alloy by weight percentage are: 3.5 to 5.5 percent of Al, 4.0 to 8.0 percent of V, 5.0 to 7.0 percent of Cr, 3.0 to 7.0 percent of Mo, and the residual amount of Ti and inevitable impurities. The nominal chemical composition of the high-strength high-tenacity titanium alloy is Ti-4Al-6V-6Cr-5Mo, compared with Ti-1023 titanium alloy and BT22 titanium alloy, the alloy uses Ti-Al-Mo-V-Cr alloy system, so as to increase the content of alloying elements, and reasonably adjusts the proportion of aluminum equivalent and molybdenum equivalent, so that the strength index and the tenacity index of the alloy is obviously improved and the performance of the alloy is more excellent. The obdurability of the high-strength high-tenacity titanium alloy can reach that: the strength sigmab is more than or equal to 1,200MPa, and the fracture toughness K1C is more than or equal to 65MPa m.

Description

technical field The invention relates to a high-strength and high-toughness titanium alloy, which is mainly used to manufacture forged parts in aircraft fuselage, wing and landing gear structural parts. Background technique High-strength and high-toughness titanium alloys are one of the main directions for the development of titanium alloys. In the 1970s, two typical high-strength and high-toughness titanium alloys - BT22 (Ti-5Al-5Mo-5V-1Cr-1Fe) in Russia, and Ti-1023 (Ti-10V-2Fe-3Al) in the United States were successively replaced High-strength steel (such as 30CrMnSiA) is used to manufacture aircraft load-bearing components, reducing the weight of aircraft structures by more than 20%. At present, the two grades of titanium alloys are still the most widely used titanium alloys in this field. Taking Ti-1023 as an example, it is mainly used to manufacture forged parts in aircraft fuselage, wing and landing gear structures. The two commonly used strength levels are (1) 1105...

AI Technical Summary

Problems solved by technology

Existing high-strength and high-toughness titanium alloy materials are no longer sufficient to meet this requirement