Ti3Al8V6Cr4Mo4Zr

Ti3Al8V6Cr4Mo4Zr is a titanium alloy alloyed with aluminum, vanadium, chromium, molybdenum, and zirconium. Its nominal composition is Ti-3 wt% Al-8 wt% V-6 wt% Cr-4 wt% Mo-4 wt% Zr, with balance titanium and trace impurities. It is categorized as a near-beta titanium alloy designed to balance high strength with good toughness and elevated-temperature performance.

The alloy is stabilized primarily by beta-phase stabilizers (V, Mo, Cr, Zr) with a modest aluminum content, which promotes a metastable beta structure at room temperature. Through appropriate heat treatment, its microstructure can be adjusted to consist of retained beta with varying amounts of alpha/beta phases, yielding a combination of high strength and reasonable toughness. The balance of alloying elements is intended to provide good creep resistance and strength-to-weight ratio for demanding applications.

Typical properties after proper heat treatment include a room-temperature tensile strength in the range of about 1000–1250 MPa and a yield strength around 900–1100 MPa, with elongation in the single-digit to low-teens percent range depending on processing. The density remains close to that of other titanium alloys, contributing to a favorable strength-to-weight ratio, and the modulus is around 110 GPa. Corrosion resistance is generally good in aerospace environments, though high-temperature oxidation can be a consideration.

Processing and fabrication commonly involve hot forming or forging, followed by solution treatment (approximately 800–900 °C) and quenching, then aging to reach targeted strength. Welding is feasible but requires standard precautions for titanium alloys and may necessitate post-weld heat treatment to optimize properties. Applications are typically in aerospace structural components, fasteners, and high-strength machine parts where high strength-to-weight performance is critical.