GRX-810 Alloy Composition, Properties & AM Uses

GRX-810 Alloy Composition, Properties and Aerospace Applications

For decades, aerospace engineers have worked within a frustrating constraint: the materials capable of surviving the most extreme heat environments were either too brittle, too expensive to manufacture at scale or too difficult to form into the complex geometries that propulsion systems demand. GRX-810 was developed to address that problem.

What Is GRX-810?

GRX-810 is a high-temperature metal alloy developed by NASA's Glenn Research Center in Cleveland, Ohio. It was designed specifically for use in additive manufacturing (AM), known as 3D printing, and built to perform in the kind of heat environments that exceed the limits of many conventional aerospace materials.

What makes GRX-810 different from other high-temperature alloys is its classification as an oxide dispersion strengthened (ODS) alloy. In practical terms, this means the alloy is reinforced with fine ceramic particles distributed throughout its metal structure. Those particles contribute to the alloy's ability to maintain strength and resist deformation at temperatures where other alloys begin to break down.

GRX-810 Composition: What It Is Made Of?

GRX-810 is a nickel-cobalt-chromium-tungsten ODS alloy. Rhenium is also present in the composition, along with smaller additions of niobium, titanium and aluminum. By weight, the nominal composition is approximately 32 percent cobalt, 30 percent chromium, 3 percent tungsten, 1.5 percent rhenium, 0.8 percent niobium, 0.3 percent titanium and 0.3 percent aluminum, with nickel making up the balance.

The alloy's high-temperature performance comes from a combination of mechanisms rather than from any single one. These include solid solution strengthening from the base composition, a stable network of carbides and a nanoscale dispersion of yttrium oxide (Y₂O₃) particles distributed throughout the microstructure.

The defining feature of GRX-810's composition is the addition of Y₂O₃ in the form of nanoscale particles. These particles are present at less than 1 percent of the total composition by weight, but their effect on performance is significant. Distributed evenly throughout the metal matrix, they resist grain boundary movement and dislocation activity at high temperatures. That resistance is a primary reason GRX-810 holds its structure and strength where other alloys do not.

The Y₂O₃ particles are not mixed into the alloy through conventional means. Instead, they are applied as a coating onto the surface of the pre-alloyed metal powder before the additive manufacturing process begins. When the powder is processed through AM, those particles are dispersed throughout the build. This approach achieves a level of oxide dispersion that traditional manufacturing methods, such as mechanical alloying or casting, have difficulty replicating at commercial scale.

Why GRX-810 Is Made Through Additive Manufacturing?

The composition of GRX-810 is not separable from the process used to produce it. The nano-scale Y₂O₃ dispersion, the feature most responsible for GRX-810's creep performance and thermal stability, cannot be achieved through casting or conventional powder metallurgy at commercial scale. Mechanical alloying can produce comparable microstructures in smaller quantities, but the process is resource-intensive and difficult to control consistently across production batches.

Additive manufacturing solves this by incorporating the Y₂O₃ distribution into the build process itself. As each layer of powder is fused, the oxide particles are locked into position, producing a consistent microstructure throughout the component. The quality of the final part is therefore directly tied to the quality of the incoming powder, including its particle size distribution, shape, purity and the evenness of the Y₂O₃ coating on each individual particle. Inconsistencies in the powder translate into inconsistencies in the finished component's microstructure and properties.

This is why powder feedstock qualification is a foundational concern for GRX-810 programs. 

Frequently Asked Questions

What is GRX-810?

GRX-810 is a high-temperature metal alloy developed by NASA's Glenn Research Center for use in additive manufacturing. It is classified as an oxide dispersion strengthened (ODS) alloy and was designed for aerospace components that operate under sustained high-temperature, high-stress conditions.

What is GRX-810 made of?

GRX-810 is a nickel-cobalt-chromium-tungsten ODS alloy. Its composition also includes rhenium, along with small additions of titanium, aluminum and niobium.[SA1.1] Its defining feature is the addition of nanoscale yttrium oxide (Y₂O₃) particles dispersed throughout the metal matrix, which give the alloy its high-temperature strength and creep resistance.

Why is GRX-810 used in additive manufacturing?

GRX-810 was designed for 3D printing and aerospace applications. It is capable of withstanding temperatures up to 1,100°C. The ability to 3D print GRX-810 provides engineers the flexibility in design to optimize parts with complex geometries, including internal channels and lattice structures that can be difficult to produce with traditional manufacturing methods. This can also allow for the consolidation of multiple components into a single printed part, helping to reduce weight and simplify assembly. 

About Linde Advanced Material Technologies

Linde Advanced Material Technologies (Linde AMT) is a global leader in advanced materials, coating services and powder production, with more than 75 years of coating innovation. Operating across 35 locations in 12 countries, Linde AMT serves industries where material performance directly affects operational reliability, including aerospace, energy and industrial manufacturing.

With a team of 2,500 engineers, technologists and experts, Linde AMT brings together powder manufacturing, coating application, and research and development under one organization. That breadth supports the development of customized solutions for complex customer problems, drawing from a portfolio of more than 300 coatings and 500 powder chemistries. Linde AMT operates as part of Linde PLC, a leading global industrial gases and engineering company.