Effect of potential difference between nano-Al<sub>2</sub>O<sub>3</sub> whisker and Mg matrix on the dispersion of Mg composites

Xiaoying Qian; Hong Yang; Chunfeng Hu; Ying Zeng; Yuanding Huang; Xin Shang; Yangjie Wan; Bin Jiang; Qingguo Feng

doi:10.1007/s12613-022-2550-0

Volume 30 Issue 1

Jan. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(1): 104-111

Xiaoying Qian, Hong Yang, Chunfeng Hu, Ying Zeng, Yuanding Huang, Xin Shang, Yangjie Wan, Bin Jiang, and Qingguo Feng, Effect of potential difference between nano-Al₂O₃ whisker and Mg matrix on the dispersion of Mg composites, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 104-111. https://doi.org/10.1007/s12613-022-2550-0

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Xiaoying Qian, Hong Yang, Chunfeng Hu, Ying Zeng, Yuanding Huang, Xin Shang, Yangjie Wan, Bin Jiang, and Qingguo Feng, Effect of potential difference between nano-Al2O3 whisker and Mg matrix on the dispersion of Mg composites, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 104-111. https://doi.org/10.1007/s12613-022-2550-0

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Research Article

Effect of potential difference between nano-Al₂O₃ whisker and Mg matrix on the dispersion of Mg composites

+ Author Affiliations

Corresponding authors:
Hong Yang    E-mail: hong.yang@cqu.edu.cn

Bin Jiang    E-mail: jiangbinrong@cqu.edu.cn

Qingguo Feng    E-mail: qfeng@swjtu.edu.cn
Received: 4 July 2022; Revised: 22 August 2022; Accepted: 9 September 2022; Available online: 10 September 2022

Abstract

Abstract

The potential difference between positive and negative ions was utilized to improve the homogenized dispersion of nanoscale Al₂O₃ whiskers in Mg matrix composites. The Mg powders were decorated with sodium dodecylbenzene sulfonate (C₁₈H₂₉NaO₃S, SDBS) and were introduced to the cathode group on their surface. The Al₂O₃ whiskers were modified by the cetyl trimethyl ammonium bromide (C₁₉H₄₂BrN, CTAB) and were featured in the anode group. The suitable contents of CTAB and SDBS, the application atmosphere, and the type of solvents were investigated. Dispersion results showed that adding 2wt% SDBS into Mg powders and adding 2wt% CTAB into Al₂O₃ whiskers promoted the formation of more uniformly mixed composite powders, compared to those of conventional ball milling via scanning electron microscopy (SEM) analysis. Meanwhile, the calculated results derived from first-principle calculations also demonstrated the stronger cohesion between Al₂O₃ whisker reinforcements and Mg matrix than undecorated composite powders. After preparation by powder metallurgy, the morphology, grain size, hardness, and standard deviation coefficient of composites were analyzed to evaluate the dispersed efficiency. The results indicated that the modification of homogenized dispersed Al₂O₃ whiskers in composites contributed to the refinement of 26% in grain size and the improvement of 20% in hardness compared with pure Mg, and the reduction of 32.5% in the standard deviation coefficient of hardness compared with the ball-milling sample.
- magnesium-based composites;
- Al₂O₃ whiskers;
- potential difference;
- dispersion

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