Researchers at the University of Helsinki have investigated the radiation resistance of tungsten-based refractory high-entropy alloys (RHEAs), materials made from multiple metals in equal proportions, often considered for use in extreme environments like nuclear reactors. Their simulations, enhanced by machine learning, focused on radiation-induced atomic displacements, which create structural defects. Surprisingly, they discovered that the alloy’s threshold displacement energy—the energy needed to displace atoms—is lower than that of its constituent metals, suggesting a higher susceptibility to defect formation. However, the material still exhibits remarkable radiation resistance, implying other mechanisms, such as defect diffusion, are at play. These findings could guide the development of even more resilient materials for harsh environments.
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