A team at Pacific Northwest National Laboratory has developed a cobalt alternative alloy that could shift the balance in global energy and defense supply chains. Designed to replace cobalt—a critical material largely sourced from China—the manganese-based alloy shows potential for use in nuclear reactors, turbines, and aerospace components.
A government research team has developed a cobalt alternative alloy that may help the United States sidestep one of its most persistent supply chain vulnerabilities: dependence on China for cobalt, a metal essential to high-performance components in energy and aerospace applications.
Scientists at the Department of Energy’s Pacific Northwest National Laboratory (PNNL) engineered a new alloy that swaps out cobalt for manganese. The development could lessen U.S. exposure to volatile global cobalt markets and advance domestic clean energy efforts, particularly in the nuclear sector.
“More researchers must realize the opportunities to reduce or replace critical materials that are on the supply risk list,” said Isabella van Rooyen, senior technical advisor for advanced material systems at PNNL. “This allows us to move faster during manufacturing while maintaining performance requirements.”
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Why a Cobalt Alternative Alloy Matters Now
Cobalt is a key ingredient in nickel-based superalloys, valued for its ability to withstand extreme heat and stress. These alloys are essential in nuclear reactors, jet turbines, and space vehicles—sectors where material failure is not an option.
More than 75% of the world’s refined cobalt is controlled by China, most of it mined in the Democratic Republic of Congo. This dominance has made cobalt one of the most geopolitically sensitive materials in the global economy.
The U.S. government has identified cobalt as a critical mineral at risk of supply disruptions. In response, researchers have been under pressure to find viable cobalt alternatives that preserve performance while reducing strategic vulnerabilities.
How the New Alloy Works
The cobalt alternative alloy developed at PNNL replaces cobalt with manganese, a more abundant and domestically available element. Manganese offers similar thermal stability and corrosion resistance, making it a promising substitute in environments like next-generation reactors and aerospace engines.
Rather than relying exclusively on lab experiments, the PNNL team used advanced computational modeling to simulate various alloy compositions. These simulations identified manganese as a prime candidate for replacing cobalt without sacrificing mechanical integrity.
To fabricate the alloy, researchers employed two techniques:
- Conventional casting for baseline comparison
- Friction stir consolidation, a modern process that uses frictional heat and pressure to customize the alloy’s microstructure without melting it
This dual-method approach enabled scientists to optimize the alloy’s grain structure, enhancing its strength and durability under operational stress.
Friction Stir Consolidation: A Game-Changer for Alloy Design
Friction stir consolidation, unlike conventional melting methods, allows for precise control over material formation. It consumes less energy and enables faster production cycles—critical factors for industrial adoption.
PNNL researchers say this technique could be used not just for this cobalt-free alloy, but for other materials that aim to replace hard-to-source metals.
“If we can achieve performance parity or better with alternative elements, it opens up a new design space,” said van Rooyen.
What’s Next for the Cobalt Alternative Alloy?
PNNL is currently seeking industry partners to scale up production and test the alloy in real-world conditions. Preliminary data shows the material meets the mechanical standards required for advanced nuclear environments, but broader validation is needed for applications in aerospace and defense.
The project is funded by the Department of Energy’s Advanced Materials and Manufacturing Technologies Office, which aims to fast-track commercialization of critical material innovations.
If successful, the cobalt alternative alloy could:
- Lower costs in manufacturing by using widely available raw materials
- Reduce geopolitical exposure tied to cobalt imports
- Strengthen the U.S. domestic supply chain for energy and defense materials
A Strategic Shift in Material Sourcing
The U.S. has been scrambling to diversify supply chains for critical materials since 2020. Efforts like the Inflation Reduction Act and Defense Production Act have pumped billions into rare earth and battery material development. Yet cobalt remains among the most challenging minerals to replace—until now.
Analysts caution that while promising, adoption will require rigorous testing and long-term investment.
“This is a critical step forward, but manufacturers will need to see long-term reliability before switching over,” said an energy policy expert at the Center for Strategic Materials. “Still, the fact that the U.S. is innovating on material science at this level is a good sign for industrial security.”
As the world braces for tighter mineral supplies and rising geopolitical tensions, innovations like the cobalt alternative alloy offer a path toward resilient, American-made solutions. If the alloy performs as expected, it could mark a pivotal shift in how the U.S. designs, manufactures, and safeguards its most sensitive infrastructure.
