Dual-precipitates enhance fatigue resistance in an additively manufactured high-entropy alloy
Year: 2026
Type: article
Abstract: To accomplish the intense desire of high-strength materials for enhanced energy-efficiency, recent research applies a combined strategy of additive-manufacturing and precipitation-strengthening in high entropy alloys. In a context, Al0.2Co1.5CrFeNi1.5Ti0.3 nanoprecipitation-strengthened system was developed, demonstrating very convincing strength and toughness. Moreover, additive-manufacturing facilitated additional strength by well-decorated cell-boundaries with blocky L21 precipitates and homogeneously distributed L12 precipitates. However, fatigue research of this alloy remained unexplored despite being the main precursor for structural applications. In this study low-cycle fatigue behavior of this alloy in both as-built and precipitation-strengthened (aged) conditions has been explored, combined with in-situ neutron diffraction investigation. Findings revealed a substantial cyclic-stress profile and a notable fatigue-life below ±0.50% strain-amplitude, exceeding 105 cycles at ±0.30% strain-amplitude. These demonstrate the potential to carry higher payloads with marked engineering-reliability. Residual-stress estimation revealed strain-compatibility between the matrix and L12 precipitate, indicating a crack-initiation immune interface. A comparative examination of dislocation character revealed shifting towards pure edge-character in aged alloy indicates precipitates promoted planar-slip during deformation. The demand for high-strength materials to enhance energy efficiency drives research into additive manufacturing and precipitation strengthening of high entropy alloys. Here, the authors investigate the low-cycle fatigue behavior of an Al-Co-Cr-Fe-Ni-Ti alloy, revealing impressive fatigue life and stress profiles, highlighting its potential for reliable structural applications.
Source: Communications Materials
Institutions: National Yang Ming Chiao Tung University, National Tsing Hua University, Indian Institute of Technology Kanpur, University of Tennessee at Knoxville, Oak Ridge National Laboratory, Chungnam National University, Indian Institute of Technology Delhi, Los Alamos National Laboratory, Center for Integrated Nanotechnologies
Language: English
Topic: High Entropy Alloys Studies
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,690
Funders: National Science Foundation, U.S. Department of Energy, Center for Integrated Nanotechnologies, National Research Foundation, Indian Institute of Technology Kanpur, Shanghai Educational Development Foundation, Ministry of Education, India, National Tsing Hua University, National Synchrotron Radiation Research Center, National Science and Technology Council, Office of Science, National Nuclear Security Administration, Division of Materials Research, Army Research Office, Oak Ridge National Laboratory, Los Alamos National Laboratory
Awards: G1017065088, G1279347439, G1527848044, G1566840668, G1572340682, G1697052219, G1912732311, G2747436919, G3152192065, G3222236293, G3268810320, G3301260941, Fundamental Study of Low-Cycle-Fatigue Behavior of High-Entropy Alloys, G5015135572, G517849605, G5675951102, G608057831, G6168134873, G6274897657, G6365035500, G6410514744, G6460610086, G648842122, G659216689, Collaborative Research: Nanoscale Structural and Compositional Instability-Driven Ductility in Refractory High-Entropy Alloys, G70659677, Collaborative Research: In situ Diffraction and Cohesive-Zone Studies of the Fatigue-Crack-Growth Behavior in Mg Alloys, G7452299184, G7683027053, G7977574923, G8415477955, G8727049869, G8758690722, G8783338306
OpenAlex ID: W7157207958