Researchers at USC have developed a process of combinatorial additive manufacturing to discover new heat-resistant alloys.
It’s an engineer’s worst nightmare: exposed to high heat, the finely tuned machine you’ve designed and built suddenly melts to the texture of butter.
In recent decades, nickel-based alloys – formed by combining nickel with elements such as chromium, copper, or iron for greater durability – have become a go-to in the aerospace industry and elsewhere. The trouble is, these materials typically break down around 1000 °C. That’s a real problem when it comes to applications such as hypersonic flight, space exploration and advanced energy systems.
Researchers at USC and partner institutions have discovered a tungsten-based alloy that maintains extraordinary strength at temperatures up to 1400 °C – and they found it in an afternoon’s work. The composition W₄₂Re₃₀Os₂₈ was identified using a revolutionary 3D-printing technique that dramatically reduces the time required to reach the optimal outcome – from several weeks to as little as a couple of hours.
The achievement represents a significant advance over existing methods and materials. The new alloy achieves a yield strength of about 1.8 gigapascals at room temperature, while still sustaining roughly 1.4 gigapascals at 1400 °C.
The findings appear in a new paper published in Nature Communications, co-authored by researchers at USC, the University at Buffalo, the University of Massachusetts Amherst and Dalian Jiaotong University in China.
Wen Chen, associate professor in the USC Viterbi Department of Aerospace & Mechanical Engineering, and the Mork Family Department of Chemical Engineering & Materials Science, served as co-principal investigator of the paper. As a specialist in additive manufacturing (3D-printing) for the development of advanced materials, Chen contributed to a solution that focused on a class of materials known as high-entropy alloys. Unlike traditional alloys, which are dominated by one primary element, these materials combine several elements in comparable proportions, opening up a vast design space – but one that is difficult to explore without rapid iteration or “high-throughput” tools.
Chen and his collaborators experimented with high-resistant compositions based on the elements tungsten (W), rhenium (Re), and osmium (Os). All three elements have melting points above 3000 °C, making them attractive candidates for extreme environments – whether gas turbines, nuclear reactors or the limits of Earth’s atmosphere.
The combinatorial approach
“At the core of the study is a technique known as combinatorial additive manufacturing,” said Chen. “Rather than fabricating one alloy at a time, our team used a laser-based metal 3D printing platform that can precisely control the feed rates of multiple elemental powders.”
By continuously varying those feed rates during a single printing run, in just a few hours the system produced nearly 500 distinct compositions with different chemical makeups. That’s a giant leap forward from the outdated alchemy of melting and remelting metals of slightly different ratios.
“In a conventional workflow, a single alloy might require several days to fabricate, test and analyze,” Chen explained. “By contrast, the combinatorial method allows for hundreds of options to be synthesized and screened in parallel.”
The manner in which those new materials are evaluated is equally innovative. Instead of relying on labor-intensive mechanical tests, the team used automated indentation measurements (essentially, microscopic “pokes”) to map hardness and strength. These tests were performed at temperatures as high as 1400 °C, revealing which compositions could pass the test of industry standards.
The winner: W₄₂Re₃₀Os₂₈
Using their combinatorial platform, the researchers systematically explored close to the entire composition range of these elements. Out of hundreds of candidates, one composition – W₄₂Re₃₀Os₂₈ was a clear winner when it came to resilience.
The alloy’s performance under extreme heat sets it apart. While many materials lose their strength dramatically at high temperatures, W₄₂Re₃₀Os₂₈ retains roughly 78% of its room-temperature strength even at 1400 °C. Mechanical testing confirmed these numbers translate to about 1.4 gigapascals of yield strength at extreme temperatures – performance that puts it in a class beyond conventional super-alloys.
The implications extend beyond a single material. According to Chen, the real advance lies in the method demonstrated by the study. By integrating additive manufacturing with high-throughput characterization and data-driven screening, the team has established an effective route for discovering materials tailored to specific performance targets.
Material futures
In aerospace systems, materials that remain strong at higher temperatures could allow engines and structural components to operate more efficiently, potentially reducing cooling requirements and overall system weight. In emerging fields such as nuclear fusion, where components face sustained thermal and mechanical extremes, the need for such materials is even more acute.
Although tungsten-based alloys are dense, their ability to carry far higher loads at elevated temperatures means that less material may be needed overall. “When strength increases by multiples at operating temperature, the usual trade-offs between weight and performance begin to look very different,” said Chen.
Looking ahead, the team aims to shortcut the path from concept to deployment by introducing predictive models to the additive manufacturing process, enabling engineers to identify super-alloys that perform reliably under high tensile loads as well as compression.
Ultimately, the world we can engineer is dependent on what our materials can withstand. And that threshold – through techniques like combinatorial additive manufacturing – is about to reach beyond what was previously thought possible.
Published on February 19th, 2026
Last updated on February 27th, 2026