Organisational evolution and property enhancement induced by thermal deformation behaviour during precision forming of large structural components of Al0.1CoCrFeNiRE high-entropy alloy

doi:10.1016/j.jmst.2025.11.033

Abstract

Abstract: To enable precision forming of large components, Φ 110 mm Al_0.1CoCrFeNiRE high-entropy alloys (HEAs) ingots were prepared by vacuum magnetic levitation melting. Multidirectional isothermal free forging (1150-1200 °C, 1000 kg) markedly enhanced the mechanical properties: yield strength increased by 204 MPa, ultimate tensile strength by 220 MPa, and elongation by 5.87 %, with the fracture mode transitioning from quasi-cleavage to ductile. Hot processing maps based on the dynamic materials model (DMM) identified a safe processing parameter at 1150 °C/0.001 s^-1 for the cast alloy, which exhibited instabilities at low temperatures and high strain rates. For the forged alloy, 1200 °C/1 s^-1 was determined as the optimum parameter, under which dynamic recrystallization and annealing twinning collaboratively refined the grains to 7.17 µm. This work elucidates the hot deformation mechanisms and provides a critical foundation for the industrial precision forming of large HEA components such as aero-engine parts.

Key words: Forged Al_0.1CoCrFeNiRE HEAs, Mechanical properties, Compressive behavior, High temperature deformation, Dynamic recrystallization

Xiangning Chen, Pan Chen, Wenyu Tang, Yuhang Guo, Ye Cheng, Qianhao Zang, Hongfu Xiang, Weiguo Yang. Organisational evolution and property enhancement induced by thermal deformation behaviour during precision forming of large structural components of Al_0.1CoCrFeNiRE high-entropy alloy[J]. J. Mater. Sci. Technol., 2026, 264: 274-291.

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Organisational evolution and property enhancement induced by thermal deformation behaviour during precision forming of large structural components of Al_0.1CoCrFeNiRE high-entropy alloy

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