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Methods for improving the performance of high-temperature titanium alloy foil in existing technologies

The methods for improving the performance of high-temperature titanium alloy foil in existing technologies mainly include the following aspects:

1. Trace addition of alloying elements and organizational control
• Add trace elements such as silicon (Si), boron (B), carbon (C), etc. to near-α and α+β titanium alloys to achieve grain refinement and improve the superplasticity and high-temperature strength of the material.

• By regulating the distribution and size of α phase and β phase in the alloy, the creep resistance and thermal stability of the material are optimized, and the high-temperature service performance is enhanced.

2. Grain boundary structure optimization (relaxed grain boundary)
• Nanocrystalline materials are manufactured using special plastic deformation technology, and the grain boundary energy is reduced through grain boundary relaxation to form a low-index flat interface, which effectively inhibits grain boundary migration and diffusion at high temperature, and significantly improves high-temperature strength and creep resistance. • This technology can greatly improve the mechanical properties of high-temperature alloys and reduce dependence on alloying elements, which is conducive to the sustainable development of materials.

3. Multi-element alloying and heat treatment process
• Through multi-element alloying (such as adding Al, Mo, V, Nb, rare earth elements Y, Nd, etc.) combined with heat treatment, a structure with α lamellae and a small amount of residual β phase is formed, taking into account both high-temperature thermal strength and thermal stability. • The addition of rare earth elements forms high-melting point compounds through internal oxidation, improving oxidation resistance and creep properties.

• Adopting processes such as near-β forging and β solution treatment to optimize the structure.

4. Advanced preparation technology: spark plasma sintering
• By using titanium foil and aluminum foil alternately stacked, heating to above the melting point of aluminum and sintering in a spark plasma sintering furnace, a Ti-Al intermetallic compound material with an alternating micro-laminated structure is prepared.

• This method effectively controls the oxygen content, eliminates pores, improves the density and uniformity of the material, and significantly improves the mechanical properties and high-temperature stability.

5. Surface strengthening and coating technology
• Use surface treatment technologies such as laser cladding and shot peening to form a high-temperature oxidation-resistant coating, improve the surface oxidation resistance and corrosion resistance of titanium alloy foil, and extend its high-temperature service life.

6. Purification and gas content control
• Through special smelting processes and reasonable purifier technology, the gas element content in the material is reduced to an extremely low level (such as below 5ppm), improving the material's processing performance and high-temperature mechanical properties.

In summary, the key to improving the performance of high-temperature titanium alloy foil lies in alloy design and microstructure regulation, grain boundary structure optimization, advanced sintering preparation technology, surface strengthening treatment, and strict material purification control. These methods work together to significantly enhance the high-temperature strength, creep resistance and thermal stability of titanium alloy foil, and promote its application in high-end fields such as aerospace.