A method for improving fatigue properties of eutectic high entropy alloys by electron beam surface treatment

The eutectic high entropy alloy AlCoCrFeNi2.1 was remelted and rapidly cooled through electron beam surface treatment technology to refine the grains and introduce residual compressive stress, which solved the problem of insufficient fatigue strength and significantly improved the fatigue performance and service life.

CN115584398BActive Publication Date: 2025-09-05ZHEJIANG UNIV OF TECH
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Patent Information

Application Number
CN202211480199.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-24
Publication Date
2025-09-05
Estimated Expiration
2042-11-24

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Abstract

The present invention belongs to the technical field of high entropy alloy surface treatment, and specifically relates to a method for improving the fatigue performance of eutectic high entropy alloy by electron beam surface treatment. The method comprises the following steps: (1) treating the eutectic high entropy alloy AlCoCrFeNi 2.1 Divide into equal eutectic high entropy alloy blocks, clean them by ultrasonic cleaning, grind and polish them, and then blow dry them; (2) place the eutectic high entropy alloy blocks obtained in step (1) in an electron beam vacuum chamber, set the electron beam parameters and the overlap rate of remelting, perform electron beam remelting treatment, and then quickly cool them to room temperature in the vacuum chamber, take them out, and grind and polish them. The electron beam surface strengthening technology used in the present invention to treat the eutectic high entropy alloy AlCoCrFeNi 2.1 , which greatly reduces the fatigue crack propagation rate compared with the untreated cast eutectic high entropy alloy, greatly improving its fatigue performance.
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Patent Citations

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