Ti-6Al-4V

(in wt. %) ==Physical and mechanical properties==

Ti-6Al-4V titanium alloy commonly exists in alpha, with hcp crystal structure, (SG : P63/mmc) and beta, with bcc crystal structure, (SG : Im-3m) phases. While mechanical properties are a function of the heat treatment condition of the alloy and can vary based upon properties, typical property ranges for well-processed Ti-6Al-4V are shown below. Aluminum stabilizes the alpha phase, while vanadium stabilizes the beta phase. Ti-6Al-4V has a very low thermal conductivity at room temperature of 6.7 to 7.5 W/m·K, which contributes to its relatively poor machinability. == Heat treatment of Ti-6Al-4V ==

Ti-6Al-4V is heat treated to vary the amounts of and microstructure of \alpha and \beta phases in the alloy. The microstructure will vary significantly depending on the exact heat treatment and method of processing. Three common heat treatment processes are mill annealing, duplex annealing, and solution treating and aging. ==Applications==

• Aerospace structures. The Boeing 787 is 15% titanium by weight, and the Airbus A350 is 14%. • Biomedical implants and prostheses. • High-performance race cars. • High-end bicycles. • Additive manufacturing. • Marine applications: Ti-6Al-4V Grade 5 is extensively used in marine applications due to its exceptional corrosion resistance in seawater environments. Ti-6Al-4V is applied in components exposed to marine atmospheres and underwater conditions, such as shipbuilding, offshore oil and gas platforms, and subsea equipment. Its resistance to corrosion helps in reducing maintenance costs and extending the lifespan of marine equipment. • According to Apple, the 2025 iPhone Air's structural frame is made out of polished Grade 5 titanium. ==Specifications==

• UNS: R56400 • AMS Standard: 4928 • ASTM Standard: F1472 • ASTM Standard: B265 Grade 5 ==References==