Additive manufacturing method for high-toughness CoCrNiAl eutectic high-entropy alloy

By rapidly cooling during additive manufacturing to form a fine and uniform B2 phase structure, the stress concentration problem in the later stage of deformation of eutectic high-entropy alloys is solved, realizing the preparation of high-strength and high-toughness eutectic high-entropy alloys suitable for industrial production.

CN121945802APending Publication Date: 2026-05-01INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202610124628.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-29
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Traditional additive manufacturing of metallic materials has shortcomings in terms of strength and toughness, especially in eutectic high-entropy alloys, where stress concentration and reduced plasticity are caused by dislocations bypassing bulk precipitates in the later stages of deformation.

Method used

Rapid cooling during additive manufacturing enables in-situ refinement of the eutectic high-entropy alloy microstructure, forming a cellular structure with a diameter of several hundred nanometers. This promotes the transformation of dislocations from bypassing to cutting through. The eutectic high-entropy alloy is prepared using laser powder bed melting technology, avoiding subsequent heat treatment.

Benefits of technology

High strength and high fracture toughness were achieved at room temperature, and high-strength and high-toughness additive manufacturing metal materials were prepared without subsequent heat treatment. The process is simple and low-cost, and suitable for industrial production.

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Abstract

The invention belongs to the technical field of high-entropy alloys, and particularly relates to a high-toughness CoCrNiAl series eutectic high-entropy alloy additive manufacturing method. Aiming at the condition that traditional additive manufacturing metal materials are insufficient in strength and toughness, the invention provides the principle that in-situ refining of an additive manufacturing structure is realized through a fine and uniform B2 phase capable of being sheared by utilizing the characteristic of rapid solidification of additive manufacturing, so that the strength and toughness are comprehensively improved. Based on the principle, the general formula of the eutectic high-entropy alloy is CoaCrbNicAld, a is larger than or equal to 29 and smaller than or equal to 35, b is larger than or equal to 18 and smaller than or equal to 23, c is larger than or equal to 27 and smaller than or equal to 35, d is larger than or equal to 13 and smaller than or equal to 19, and a + b + c + d = 100. The eutectic high-entropy alloy prepared through the laser powder bed melting technology achieves high strength, high ductility and high fracture toughness under the condition that subsequent heat treatment is not needed. The design principle of the invention can also be popularized to other eutectic high-entropy alloy systems.
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