Abstract
Carbon nanotube (CNT)-reinforced magnesium (Mg) matrix composites were fabricated through a three-step preparation process which consists of mixed ball-milling, melt processing, and hot extrusion process. The results show that mechanical ball-milling well-dispersed CNTs on zinc flakes and uniform distribution of CNTs were obtained in the composites after melt processing and hot extrusion process. Aluminum (Al) with a mass fraction of 0.3% was added into the composite melt before casting so as to induce interfacial reaction on the surface of CNTs. Consequently, in comparison with Mg-6Zn/CNT composites, the yield strength and ultimate strength of Mg-6Zn-0.3Al/CNT composites increased by 21.1% and 9.3%, respectively. Unlike CNTs in the Mg-6Zn/CNT composites, a great amount of nanosized aluminum phases which were validated to be aluminum oxide (Al2O3) were found on the surface of CNTs in the Mg-6Zn-0.3Al/CNT composites. The interfacial reaction transformed the physical combination of CNT-Mg interface into reaction bonding which increased the efficiency of load transfer contributed by CNTs.
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Acknowledgments
This work was supported by “National Natural Science Foundation of China” (Grant Nos. 51471059 and 51671066), “National Key R&D Program of China” (Grant Nos. 2016YFB0301102 and 2017YFB0703100) and Key laboratory of Lightweight and high strength structural materials of Jiangxi Province (No. 20171BCD40003).
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Shi, H., Wang, X., Hu, X. et al. Interfacial Modification Using Matrix Alloying in Mg/CNT Composites for Improved Mechanical Performance. J. of Materi Eng and Perform 28, 3041–3047 (2019). https://doi.org/10.1007/s11665-019-04068-1
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DOI: https://doi.org/10.1007/s11665-019-04068-1