Abstract
Carbon nanotube (CNT)-reinforced 6061Al (CNT/6061Al) composites were fabricated via powder metallurgy combined with friction stir processing (FSP). CNTs were dispersed after FSP and accelerated the precipitation process of the CNT/6061Al composites. However, the strengthening effect of CNTs on the T6-treated materials was insignificant, while the composites under the FSP and solution treatment conditions exhibited increased strength compared to the matrix. Precipitate-free zones (PFZs) were detected around CNTs in the T6-treated CNT/6061Al composites, and a model was proposed to describe the effect of PFZs on strength. The calculations indicated that the strength of PFZs was similar to that of the T6-treated 6061Al. As a result, the strengthening effect of CNTs on the T6-treated CNT/6061Al composites was insignificant.
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Acknowledgements
The authors gratefully acknowledge the support of National Key Research & Development Plan under Grant No.2017YFB0703100 and Key Research Program of Frontier Sciences, CAS, the CAS/SAFEA International Partnership Program for Creative Research Teams and the National Natural Science Foundation of China under Grant No. 51501189.
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Zhao, K., Liu, ZY., Xiao, BL. et al. Origin of Insignificant Strengthening Effect of CNTs in T6-Treated CNT/6061Al Composites. Acta Metall. Sin. (Engl. Lett.) 31, 134–142 (2018). https://doi.org/10.1007/s40195-017-0626-z
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DOI: https://doi.org/10.1007/s40195-017-0626-z