High-Entropy Alloy Welding Techniques and Mechanical Properties
Summary
High-entropy alloys (HEAs) represent a paradigm shift in structural materials, leveraging multiple principal elements to achieve exceptional strength, ductility and thermal stability. Welding these alloys requires careful control of thermal input and process selection to manage complex phase transformations, grain-size evolution and elemental segregation. Fusion-based methods such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) enable direct joining but often generate coarse grains and heterogeneity in the fusion zone and heat affected zone (HAZ). Laser and friction stir welding offer reduced heat input or solid-state joining paths that preserve finer microstructures. Mechanical properties of welded HEAs depend on the interplay between solid-solution strengthening, precipitate formation and texture development. Optimising filler compositions, using inoculant particles and selecting appropriate welding parameters can mitigate softening in the HAZ, prevent brittle intermetallic formation and tailor weld-zone hardness. Advances in digital image correlation and synchrotron diffraction have deepened understanding of weld-induced microstructural changes, guiding process-property relationships for applications in aerospace, energy and high-performance machinery.
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High-Entropy Alloy Welding Techniques and Mechanical Properties publication trend
The graph below shows the total number of articles in high-entropy alloy welding techniques and mechanical properties across all publications each year (not limited to Nature Index journals).
Technical terms
High-entropy alloy (HEA): A metallic material comprising five or more principal elements in near-equiatomic ratios, forming single-phase solid solutions or multiphase structures.
Fusion zone (FZ): The region of a welded joint that has been melted and resolidified during the welding process, characterised by distinctive microstructural features.
Heat affected zone (HAZ): The portion of the base material that has not melted but whose microstructure and properties have been altered by the thermal cycle of welding.
Solid-state welding: A group of joining processes (e.g., friction stir welding) that bond materials without reaching the melting point, preserving finer grain structures and minimising defects.
Digital image correlation (DIC): A non-contact optical technique used to measure full-field strains by tracking surface patterns during mechanical testing.
References
- Synergistic effects of Monel 400 filler wire in gas metal arc welding of CoCrFeMnNi high entropy alloy. Materials & Design (2024).
- Microstructure evolution and mechanical properties in a gas tungsten arc welded Fe42Mn28Co10Cr15Si5 metastable high entropy alloy. Materials Science and Engineering A (2023).
- Heterogeneous structure-induced strength-ductility synergy by partial recrystallization during friction stir welding of a high-entropy alloy. Materials & Design (2021).
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