In a groundbreaking development poised to redefine the landscape of advanced materials science, Lauren Kim, a recent Ph.D. graduate from the University of Wyoming’s Department of Physics and Astronomy, has unveiled a novel methodology that elucidates the elusive surface local chemical ordering in high-entropy alloys (HEAs). These alloys—characterized by their combination of five or more constituent elements in near-equimolar ratios—represent a new frontier in materials engineering, offering unprecedented potential for applications spanning aerospace, energy, electronics, and cryogenics.
High-entropy alloys challenge traditional paradigms of alloy composition. Historically, alloys have been optimized around one dominant element with a secondary component enhancing properties, such as strength or corrosion resistance. By contrast, HEAs leverage a complex cocktail of multiple elements, which intermix in a solid solution phase, generating materials with remarkable mechanical strength, corrosion resistance, and thermal stability. Yet, the atomic-scale arrangement of these elements, especially on surfaces where catalytic and mechanical properties are often governed, has remained an intractable puzzle.
The key to untangling this puzzle lies in understanding the concept of local chemical ordering—or the subtle, non-random arrangement of atoms within the otherwise disordered crystalline lattice. Although prior assumptions suggested some degree of local ordering, direct experimental evidence, especially at surfaces, has been conspicuously absent. This knowledge gap has thwarted efforts to precisely tailor surface properties, hampering innovations in sectors requiring materials that endure extreme environments, such as jet engines, nuclear reactors, and energy storage devices.
Kim’s research, conducted under the guidance of Professor TeYu Chien and in collaboration with a multidisciplinary team spanning several universities, sets a new standard for probing the atomic-scale surface chemistry of HEAs. Their focus centered on the well-studied CoCrFeMnNi system—a canonical high-entropy alloy known for its mechanical robustness and stability. The team employed an integrative approach combining surface-sensitive scanning tunneling microscopy (STM) with advanced computational density functional theory (DFT) simulations.
Scanning tunneling microscopy, renowned for its exceptional resolution, enabled the visualization of atomic arrangements on the alloy’s surface with quasi-long-range ordering. This means that while perfect periodicity was absent, discernible patterns in atomic distribution could be detected, challenging the prevailing notion of wholly random element placement. To refine these observations, Kim and colleagues applied DFT calculations, a quantum mechanical modeling method, which provided insights into the energetics and stability of specific atomic configurations within these quasi-ordered domains.
This dual-experimental and theoretical framework culminated in the first unequivocal observation and characterization of surface local chemical ordering in a high-entropy alloy. The implications are multifold: by correlating surface atomic organization with physical and chemical properties, scientists can now envisage engineering HEAs with tailor-made functionalities, be it enhancing catalytic activity for chemical processing or improving corrosion resistance for harsh operating environments.
“The revelation that surface local chemical ordering exists fundamentally shifts our understanding of HEAs,” explains Professor Chien. “It means that by manipulating this order, we gain a powerful lever to control surface properties—a breakthrough that had previously been out of reach due to limitations in detection technologies.”
This advancement is not only a triumph of instrumental innovation but also of international collaboration. The project synergized expertise from the University of Wyoming, University of New Haven, University of Tennessee-Knoxville, and Taiwanese institutions National Yang Ming Chiao Tung University and National Tsing Hua University. Among the notable contributors is Jien-Wei Yeh, a pioneer who first demonstrated the stability of high-entropy alloys over two decades ago, signifying the lineage and evolution of HEA research.
Beyond academic merit, the practical applications of this insight could be transformative. With precise control over atomic-scale surface arrangements, materials scientists can devise alloys that do not just meet but exceed the rigors of future technologies. Imagine turbine blades in jet engines that maintain integrity at higher temperatures, or battery components with enhanced durability and efficiency due to optimized surface catalytic reactions.
This research was facilitated by funding from the U.S. National Science Foundation and the Air Force Office of Scientific Research, underscoring the strategic importance of materials innovation in national scientific agendas. The findings were recently published in the prestigious journal Nature Communications, signaling high recognition by the broader scientific community.
Kim’s methodology includes mapping surface atoms, detecting disparities in elemental distribution, and modeling their energetic preferences using DFT calculations. This hybrid approach overcomes prior technical hurdles, such as distinguishing neighboring atoms of similar atomic numbers, and surpasses earlier indirect inference techniques that could not definitively prove local chemical order.
Looking ahead, this breakthrough opens avenues for systematic exploration of surface phenomena across other HEAs, potentially unraveling new physical principles governing alloy behavior at the nanoscale. Moreover, it suggests that entropy, traditionally viewed as a measure of disorder, might be harnessed in a nuanced manner to design materials that balance order and randomness for exceptional performance.
In summary, the direct visualization of surface local chemical ordering in HEAs marks a pivotal moment in materials science. It bridges a critical knowledge gap, delivers a versatile analytical toolkit, and lays the groundwork for designing next-generation alloys tailored at the atomic level. As industries push the boundaries of performance and durability, these advances will doubtlessly play a central role in shaping the materials of the future.
Subject of Research: Not applicable
Article Title: Direct visualization of the existence of surface local chemical order in a high-entropy CoCrFeMnNi alloy
News Publication Date: 28-Mar-2026
Web References: https://www.nature.com/articles/s41467-026-71170-z
References: 10.1038/s41467-026-71170-z
Keywords
Physical sciences, Materials science, Physics, Chemistry, High-entropy alloys, Surface local chemical ordering, Scanning tunneling microscopy, Density functional theory, CoCrFeMnNi alloy, Alloy design, Atomic-scale visualization, Advanced materials
