Influence of Annealing on Microstructure and Mechanical Properties of Al0.2CoCrFeNiMo0.3 High-entropy Alloys

HAN Chunxia; WU Ya'nan; LIU Zhiyu; LIU Jingshun

doi:10.3969/j.issn.1674-6457.2025.12.003

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (12) : 25-34. DOI: 10.3969/j.issn.1674-6457.2025.12.003

Advanced Forming Engineering of High-Entropy and Amorphous Alloys

Influence of Annealing on Microstructure and Mechanical Properties of Al_0.2CoCrFeNiMo_0.3 High-entropy Alloys

HAN Chunxia, WU Ya'nan, LIU Zhiyu, LIU Jingshun^*

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Abstract

The work aims to study the influence of different annealing temperatures after rolling deformation on microstructure and mechanical properties of high-entropy alloys, and reveal the strengthening mechanisms of rolling and heat-treatment on dual-phase high-entropy alloys. The microstructure of alloys was characterized by XRD (X-ray Diffraction), SEM (Scanning Electron Microscopy), EDS (Energy Dispersive Spectroscopy), and EBSD (Electron Backscatter Diffraction). The mechanical properties were tested with a tensile testing machine and a nanoindentation tester. The results showed that: As-cast alloys exhibited an FCC (Face-Centered Cubic)+σ phase microstructure. The diffraction peak intensity of the σ phase decreased significantly, while it increased following annealing at 800 ℃ after 90% rolling deformation. After annealing at different temperatures, the microstructure evolution process of alloys was as follows: the recovery stage was completed at 700 ℃, the recrystallization process was concluded at 900 ℃, and the recrystallized grains grew at 1 000 ℃. The microhardness of alloys increased after rolling deformation and decreased gradually as the annealing temperature rose. The variation trends of nanoindentation load-depth curves and hardness values were consistent with this. The array distribution of nanoindentation hardness was consistent with the microstructural evolution of alloys. After annealing at different temperatures, the tensile strength of alloys decreased gradually, while the elongation after fracture increased progressively. Among them, alloys annealed at 900 ℃ exhibited the optimal strength-plasticity matching, with a tensile strength of 873.4 MPa and an elongation after fracture of 12.8%. Compared with as-cast alloys, the process parameters of CR90 and annealing at 900 ℃ for 1 h can improve the strength-plasticity matching relationship of alloys and transform the strengthening mechanism into one dominated by fine grain strengthening.

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high-entropy alloys (HEAs) / rolling deformation / annealing temperature / microstructure / mechanical properties / nanoindentation

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HAN Chunxia, WU Ya'nan, LIU Zhiyu, LIU Jingshun. Influence of Annealing on Microstructure and Mechanical Properties of Al_0.2CoCrFeNiMo_0.3 High-entropy Alloys[J]. Journal of Netshape Forming Engineering. 2025, 17(12): 25-34 https://doi.org/10.3969/j.issn.1674-6457.2025.12.003

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