Method for improving high-entropy alloy strength and toughness based on entropy-enthalpy synergistic regulation

By employing a design method that coordinates entropy and enthalpy, and introducing elements with high negative mixed enthalpy combined with heat treatment processes, precise control of precipitated phases in CoCrFeNi-based high-entropy alloys was achieved. This improved the strength and plasticity of the alloys, solved the problem of uneven precipitated phase distribution in existing designs, and resulted in superior comprehensive mechanical properties.

CN122256731APending Publication Date: 2026-06-23NANJING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610299063.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-12
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

The existing nano-precipitation strengthening design of CoCrFeNi-based high-entropy alloys mainly relies on single enthalpy drive, ignoring the regulation of configuration entropy. This makes it difficult to accurately control the size and distribution of precipitated phases, and thus difficult to achieve a balance between high strength and high plasticity.

Method used

The design method of entropy-enthalpy synergistic control is adopted. By introducing metal elements with high negative mixing enthalpy such as Pd, Al and Ta, the composition ratio is determined by thermodynamic calculation. Then, through melting, homogenization, rolling and recrystallization processes, the precipitated phase is precisely controlled and the grains are refined.

Benefits of technology

It achieves the strengthening and toughening of high-entropy alloys, with yield strength increased to approximately 405-670 MPa, plastic deformation reaching 33-36%, and uniform distribution of precipitated phases within the grains, breaking through the technical barrier of balancing strength and plasticity.

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Abstract

The application discloses a method for improving the strength and toughness of a high-entropy alloy based on entropy-enthalpy synergistic regulation, which takes the mixing enthalpy and configuration entropy of a material as a design basis for regulating the composition of the high-entropy alloy material, introduces a high-negative mixing enthalpy element in a CoCrFeNi system, so that the mixing enthalpy and configuration entropy of the material present the same increasing trend with the increase of the doping element, the material as a whole tends to be metastable, and the composition fluctuation and the formation of nano precipitated phases are realized by using the negative mixing enthalpy characteristics.
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Citation Information

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