While many people are aware that GR5 titanium alloy is widely used in the aviation industry, few realize that Ti-6.5Al-1Mo-1V-2Zr is actually the most widely used and most critical medium-temperature titanium alloy in the aerospace sector. It is not a simple imitation of imported materials, but rather a "pride-inspiring alloy" independently developed by China, which has successfully solved the world-class challenge of creating load-bearing structures capable of withstanding temperatures below 500°C.
Ti-6.5Al-2Zr-1Mo-1V corresponds to Russia's BT20 and is similar to the U.S. Ti-6242S. It is a high-aluminum-equivalent near-α titanium alloy, and its most notable feature is that it perfectly combines the heat resistance and weldability of α-type titanium alloys with the process plasticity of α+β-type titanium alloys. Simply put, it possesses virtually all the advantages found in other titanium alloys, as well as advantages that other titanium alloys lack.
Let's compare it to the Gr5 titanium alloy, which everyone is most familiar with, and you'll see just how strong
Ti-6.5Al-1Mo-1V-2Zr is: Tensile strength at 500°C: Ti-6.5Al-1Mo-1V-2Zr reaches 745–850 MPa, which is more than 35% higher than Gr5.
Creep life at 500°C: Ti-6.5Al-1Mo-1V-2Zr exceeds 1,000 hours, which is five times that of Gr5.
Fracture toughness: Ti-6.5Al-1Mo-1V-2Zr is 55–70 MPa·m¹/², a 40% improvement over Gr5.
High-cycle fatigue limit: Ti-6.5Al-1Mo-1V-2Zr exceeds 450 MPa, 12.5% higher than Gr5.
What does this mean? In high-temperature areas of aircraft engines and airframes, Gr5 simply cannot withstand the conditions, whereas Ti-6.5Al-1Mo-1V-2Zr can operate continuously at 500°C for 3,000 hours with less than a 15% decline in performance.
Where is Ti-6.5Al-1Mo-1V-2Zr titanium alloy primarily used?
It is no exaggeration to say that all of China's advanced aerospace equipment relies on Ti-6.5Al-1Mo-1V-2Zr titanium alloy. It accounts for over 80% of applications in this sector, making it the true "king of aerospace titanium alloys."
Military Aviation: The "Steel Frame" of the J-20 In the J-20 fighter jet, titanium alloys account for approximately 25% of the airframe's total weight, with Ti-6.5Al-1Mo-1V-2Zr alone making up more than 30% of that total. It is used in the most critical load-bearing sections.
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