Author(s)

Zhizhi Tang ¹

Affiliation(s)

¹ Xihua University, Chengdu, Sichuan, 610039, China

Corresponding Author

Zhizhi Tang

ABSTRACT

This comprehensive study investigates the optimization of the laser selective melting (SLM) process parameters for fabricating high-performance CoCrFeNiMn-type high-entropy alloy (HEA) components. Through systematic variation of volumetric energy density inputs, a refined processing window was established to achieve near-full densification and superior mechanical properties. Microstructural characterization revealed a distinct transition from coarse columnar grains to refined equiaxed structures with decreasing energy density, accompanied by the in-situ formation of nanoscale L12-ordered precipitates under optimal conditions. The as-fabricated HEA exhibited an exceptional combination of high yield strength (718 MPa), ultimate tensile strength (978 MPa), and ductility (28% elongation). Quantitative analysis demonstrates that this outstanding performance originates from synergistic strengthening mechanisms dominated by fine grain refinement, high dislocation density from rapid solidification, and precipitation strengthening from coherent nanoparticles. Furthermore, the multi-scale hierarchical microstructure, comprising dislocation networks, nano-twins, and shearable precipitates, effectively promotes homogeneous plastic deformation and crack arrest, thereby overcoming the traditional strength-ductility trade-off. These findings establish SLM as a potent microstructural engineering platform for developing next-generation HEA components with tailored properties for demanding structural applications.

KEYWORDS

High-entropy alloy, Laser selective melting, Additive manufacturing

CITE THIS PAPER

Zhizhi Tang. Research on the Laser Selective Melting Forming Process and Strengthening and Toughening Mechanism of High Entropy Alloys. Journal of Materials, Processing and Design (2026). Vol. 10, No.1, 27-34. DOI: http://dx.doi.org/10.23977/jmpd.2026.100104.

REFERENCES

[1] Wu Y, Zhao X, Chen Q, et al. Strengthening and fracture mechanisms of a precipitation hardening high-entropy alloy fabricated by selective laser melting[J]. Virtual and Physical Prototyping, 2022, 17(3): 451-467.
[2] Gu Z, Su X, Peng W, et al. An important improvement of strength and ductility on a new type of CoCr2. 5FeNi2TiW0. 5 high entropy alloys under two different protective gases by selective laser melting[J]. Journal of Alloys and Compounds, 2021, 868: 159088.
[3] Kim Y K, Choe J, Lee K A. Selective laser melted equiatomic CoCrFeMnNi high-entropy alloy: Microstructure, anisotropic mechanical response, and multiple strengthening mechanism[J]. Journal of Alloys and Compounds, 2019, 805: 680-691.
[4] Luo S, Zhao C, Su Y, et al. Selective laser melting of dual phase AlCrCuFeNix high entropy alloys: Formability, heterogeneous microstructures and deformation mechanisms[J]. Additive Manufacturing, 2020, 31: 100925.
[5] Xi S, Chen H, Zhou J, et al. A novel eutectic high-entropy matrix composites were prepared by selective laser melting: Microstructure evolution, strengthening and fracture mechanism[J]. Journal of Manufacturing Processes, 2024, 120: 1035-1048.
[6] Tong Z, Liu H, Jiao J, et al. Improving the strength and ductility of laser directed energy deposited CrMnFeCoNi high-entropy alloy by laser shock peening[J]. Additive Manufacturing, 2020, 35: 101417.
[7] Zhu Z G, Nguyen Q B, Ng F L, et al. Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting[J]. Scripta Materialia, 2018, 154: 20-24.
[8] Lin D, Xu L, Li X, et al. A Si-containing FeCoCrNi high-entropy alloy with high strength and ductility synthesized in situ via selective laser melting[J]. Additive Manufacturing, 2020, 35: 101340.
[9] Yao H, Tan Z, He D, et al. High strength and ductility AlCrFeNiV high entropy alloy with hierarchically heterogeneous microstructure prepared by selective laser melting[J]. Journal of Alloys and Compounds, 2020, 813: 152196.
[10] Li B, Zhang L, Xu Y, et al. Selective laser melting of CoCrFeNiMn high entropy alloy powder modified with nano-TiN particles for additive manufacturing and strength enhancement: Process, particle behavior and effects[J]. Powder Technology, 2020, 360: 509-521.
[11] Zhang C, Feng K, Kokawa H, et al. Cracking mechanism and mechanical properties of selective laser melted CoCrFeMnNi high entropy alloy using different scanning strategies[J]. Materials Science and Engineering: A, 2020, 789: 139672.
[12] Luo S, Su Y, Wang Z. Tailored microstructures and strengthening mechanisms in an additively manufactured dual-phase high-entropy alloy via selective laser melting[J]. Science China Materials, 2020, 63(7): 1279-1290.

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