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Effect of Heat Treatment on Microstructure and Mechanical Properties of Multiscale SiCp Hybrid Reinforced 6061 Aluminum Matrix Composites

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Abstract

The performance of solid solution aging treatment on aluminum matrix composites prepared by powder metallurgy and reinforced with 6061 aluminum alloy powder as matrix; meanwhile, nano silicon carbide particles (nm SiCp), submicron silicon carbide particles (1 µm SiCp) and Ti particles were studied. The Al/SiCp composite powder was prepared by high-energy ball milling, and then cold-pressed, sintered, hot-extruded, and then heat-treated with different solution temperatures and aging times for the extruded composites. Optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy (EDS), X-ray diffractometer (XRD) and extrusion testing were used to analyze and test the microstructure and mechanical properties of aluminum matrix composites. The results show that after the multi-stage solid solution at 530 °C×2 h+535 °C×2 h+540 °C×2 h, the particles are mainly equiaxed grains and uniformly distributed. There is no reinforcement agglomeration, and the surface is dense and the insoluble phase is basically dissolved. In the matrix, the strengthening effect is good, and the hardness and compressive strength are 179.43 HV and 680.42 MPa, respectively. Under this solution process, when the aluminum matrix composites are aged at 170 °C for 10 h, the hardness and compressive strength can reach their peaks and increase to 195.82 HV and 721.48 MPa, respectively.

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Authors and Affiliations

  1. Institute for Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang, 212013, China

    Jianming Wu  (吴健铭), **ao**g Xu  (许晓静), Xu Zhang, Yuntian Luo, Shuaidi Li & Lin Huang

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  1. Jianming Wu  (吴健铭)
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  2. **ao**g Xu  (许晓静)
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  3. Xu Zhang
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  4. Yuntian Luo
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  5. Shuaidi Li
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  6. Lin Huang
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Corresponding author

Correspondence to **ao**g Xu  (许晓静).

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Additional information

Funded by the Key Projects of Equipment Pre-research Foundation of the Ministry of Equipment Development of the Central Military Commission of China (No.6140922010201) and the Key R&D Plan of Zhenjiang in 2018(No.GY2018021)

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Wu, J., Xu, X., Zhang, X. et al. Effect of Heat Treatment on Microstructure and Mechanical Properties of Multiscale SiCp Hybrid Reinforced 6061 Aluminum Matrix Composites. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 39, 174–181 (2024). https://doi.org/10.1007/s11595-024-2869-7

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  • DOI: https://doi.org/10.1007/s11595-024-2869-7

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