Ultra-high yield strength bulk nanocrystalline medium-entropy VCoNi alloy and preparation method thereof
Through the combination of arc smelting, cold rolling, heat treatment, inert gas condensation and ultra-high pressure compression, the preparation of high-purity bulk nanocrystalline VCoNi alloys is solved, and high-performance materials with a yield strength of 3.4GPa are achieved.
CN116162841BActive Publication Date: 2025-03-25NANJING UNIV OF SCI & TECH
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Patent Information
- Application Number
- CN202310052612.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-02-02
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2043-02-02
AI Technical Summary
Technical Problem
At present, there is a lack of mature preparation methods to prepare bulk nanocrystalline VCoNi medium-entropy alloys with high purity and average grain size less than 50 nm, resulting in the failure to fully exert their yield strength.
Method used
The combination of arc smelting, cold rolling, heat treatment, inert gas condensation and ultra-high pressure compression was used to prepare a bulk nanocrystalline VCoNi alloy with high purity, uniform tissue, and average grain size less than 50 nm.
Benefits of technology
A block medium-entropy VCoNi nanocrystalline alloy with a yield strength of up to 3.4 GPa was successfully prepared, which significantly improved the mechanical properties of the material and expanded its application prospects.
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Abstract
The invention relates to the field of nanocrystalline manufacturing and powder metallurgy, and discloses an ultra-high yield strength bulk nanocrystalline medium entropy VCoNi alloy and a preparation method thereof, wherein the microstructure is a single-phase FCC structure, the bulk nanocrystalline alloy has high purity, uniform organization, an average grain size of less than 50nm, and a yield strength of up to 3.4GPa; the chemical elements in the VCoNi alloy are in the following ratio: V:Co:Ni=1:1:1; and the purity of each pure element of the smelting parent material is ≥99.95%. The invention can prepare a high-purity bulk material with an average grain size of less than 50nm, which is difficult to prepare with the preparation process of traditional bulk nanocrystalline. The entire preparation process of the preparation scheme is completed in an ultra-high vacuum cavity, and there is no situation where the sample is oxidized, which can greatly avoid the influence of impurity elements on the performance of the sample, and plays a significant role in the development of nanocrystalline theory and engineering applications.
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