Udimet 720 is a nickel-base superalloy developed as a higher-strength evolution of the earlier Udimet 700 chemistry, built around the same gamma-prime (Ni3(Al,Ti)) strengthening mechanism but pushed further with meaningfully higher aluminum and titanium content. That richer Al+Ti balance, combined with solid-solution additions of chromium, cobalt, molybdenum, and tungsten, gives Udimet 720 a higher volume fraction of strengthening precipitate than its predecessor and correspondingly higher strength and creep resistance at elevated temperature. It belongs to the family of alloys developed specifically for rotating turbine disk applications, where the combination of tensile strength, fatigue resistance, and stability under sustained centrifugal load at temperature is the primary design driver.

A closely related powder-metallurgy variant, Udimet 720Li ("low interstitial"), was developed to allow the alloy's high Al+Ti chemistry to be processed via powder metallurgy and hot isostatic pressing, avoiding the segregation problems that heavily alloyed compositions like this one can suffer during conventional ingot casting. Both the cast-and-wrought and PM routes are used depending on section size and property requirements. In service, Udimet 720 is found in aircraft and industrial gas turbine disks and other high-stress rotating components where its strength-to-temperature capability exceeds that of earlier-generation nickel superalloys.

Udimet 720 sits toward the difficult end of the nickel superalloy machining spectrum because its high Al+Ti gamma-prime content is exactly what gives it high strength retention at temperature - the same feature that makes it valuable in a turbine disk makes it resistant to being cut. Thermal conductivity is low, so heat generated in the shear zone concentrates at the cutting edge rather than dissipating into the chip, accelerating crater wear and edge rounding. The alloy also work-hardens quickly under mechanical and thermal stress, meaning inconsistent feed or edge rubbing produces a hardened surface layer that is more difficult to cut on the following pass.

The fine, hard titanium- and aluminum-rich carbonitrides distributed through the matrix are abrasive to cutting edges, contributing to flank wear even with well-matched carbide grades. Because Udimet 720 retains a large fraction of its room-temperature strength at cutting-zone temperatures, tool edges remain under heavy mechanical load even as they heat up, which drives notching at the depth-of-cut line if speeds are pushed too high. Rigid, vibration-free workholding, sharp positive-rake coated carbide inserts, moderate-to-low cutting speeds, and generous, consistent coolant delivery are the standard countermeasures for this alloy family.