Strength and plasticity have always been contradictory issues that materials scientists hope to solve. This article proposes a novel method that improves the strong plasticity of aluminum alloys at the same time.
Compared with the stacked TiCp/Al-Mg-Si composites, the obtained alloy yields The strength has been increased from 380 MPa to 443 MPa, and the uniform elongation has been increased from 5.0% to 6.4%, which provides a new technical approach for the development and research of the design and preparation of heterostructures using nanoparticles.
In particle-reinforced aluminum matrix composites, nanoparticles can significantly increase the strength of the matrix alloy and even improve its plasticity. However, when the particle content is high, how to uniformly disperse nanoparticles is still one of the difficult problems in this field. A lot of work has shown that large plastic deformation can improve particle dispersion, and nanoparticles can effectively refine the grain structure of aluminum alloys and refine the precipitated phases. In order to use the dispersion of nanoparticles to design new micro-heterostructures and improve aluminum alloys The mechanical properties of the matrix provide new ideas.
Recently, Professor Jiang Qichuan (corresponding author) of Jilin University, Associate Professor Qinglong Zhao (corresponding author) and others have successfully prepared a new type of heterogeneous layered structure in aluminum alloy through the master alloy casting method and the cumulative rolling process. Compared with the traditional stacked-rolled nano-particle reinforced Al-Mg-Si composite material, the composite stacked-rolled Al-Mg-Si alloy/nano composite material simultaneously improves the strength and plasticity of the base aluminum alloy. Related results were published in Materials Research Letters with the title “Simultaneously increased strength and ductility via the hierarchically heterogeneous structure of Al-Mg-Si alloys/nanocomposite”. The first author of the paper is PhD student Geng Run.
The author used Al-Mg-Si alloy as the base alloy, and added the in-situ synthesized nano-TiC particles into the base alloy by the master alloy casting method. Subsequently, the cold-rolled sheet of the base alloy and the cold-rolled sheet of the nano-TiC particle reinforced composite material are composite cumulatively rolled. Finally, a composite laminated sheet with 32 layers was obtained, forming a multi-layer heterogeneous structure. The matrix layer and the composite material layer form a double-size crystal grain structure, and at the same time, the matrix chromatographic phase size is larger than the precipitate phase size of the composite material layer.
Tensile results at room temperature show that the composite rolled plate has the highest tensile strength, and compared with the traditional cumulative stacked composite material, the strength and plasticity have been improved at the same time. Compared with the stacked TiCp/Al-Mg-Si composite material, the yield strength of the Al-Mg-Si alloy/nano composite material increased from 380 MPa to 443 MPa, and the uniform elongation increased from 5.0% to 6.4%. The analysis shows that in the composite rolled material, due to the introduction of the matrix layer, different layers have different strong plasticity. Due to the different deformability, additional shearing force will be introduced, which is more conducive to the directional dispersion of nanoparticles. The appendix establishes a model for the anisotropy of tensile strength, which is suitable for nano-particle reinforced aluminum matrix composites with similar structures.
Finally, the layered distribution of TiC nanoparticles (TiCp), the new heterostructure of bimodal size grains and precipitated phases provide higher strength and improve the problem of reduced plasticity due to the difficulty of particle dispersion. This article provides a new technical approach for the development and research of the design and preparation of heterogeneous structures using nanoparticles.
In general, this paper proposes a novel method to design and manufacture a multi-layer ceramic particle strong and tough composite structure, thereby simultaneously improving the strong plasticity of aluminum alloy, and successfully in Al-Mg-Si In the laminated composite material of the matrix alloy and the TiCp/Al-Mg-Si composite material, TiC nanoparticles with a layered distribution, bimodal size crystal grains and precipitated phases are obtained.
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