2094 is a high-copper aluminum-lithium alloy, carrying 4.40-5.20% copper, the highest copper content of any grade in the FM Carbide Al-Li lineup, alongside 0.70-1.40% lithium. That combination leans on copper's strong age-hardening response for high static strength while still gaining the density and stiffness benefits that come with lithium: each percent of lithium added by weight reduces density by roughly 3% and increases elastic modulus by roughly 6% compared with conventional aluminum. Modest additions of magnesium and manganese round out the alloy's aging behavior and grain structure control.

As with the rest of this family, 2094 sits in the broader class of copper-lithium alloys developed for aerospace structures where a favorable strength-to-weight ratio directly benefits airframe performance. High-copper Al-Li alloys of this type are generally associated with higher-strength structural applications compared with lower-copper grades in the family, though the specific temper and qualification for any given application should be confirmed against current aerospace material specifications rather than assumed from composition alone.

2094 combines a high copper content with meaningful lithium content, and both elements influence how it cuts. The copper level supports good chip formation similar to other high-strength 2xxx alloys, while the lithium makes the material more chemically reactive at the cutting edge than copper alone would, increasing the tendency toward built-up edge if the tool isn't sharp or the speed is too conservative. A polished, positive-rake insert and steady coolant supply help offset that reactivity and keep the cutting zone from overheating.

Because 2094 is a higher-strength Al-Li grade, cutting forces run a bit higher than on lower-copper members of this family, which makes chip control and rigid setups even more important. It's typically machined in thin, precision aerospace sections, so managing heat and force to avoid part distortion or dimensional drift matters as much as hitting the target surface finish.

Even with these considerations, 2094 still machines far faster than steel or titanium given aluminum's inherently low shear strength and excellent thermal conductivity. Running the recommended speed range with a sharp, well-prepared edge produces better results than slowing down, which tends to promote edge buildup rather than prevent it.