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Acta Metallurgica Sinica (English Letters)

, Volume 31, Issue 2, pp 134–142 | Cite as

Origin of Insignificant Strengthening Effect of CNTs in T6-Treated CNT/6061Al Composites

Article

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.

Keywords

Metal matrix composites Carbon nanotubes Precipitate-free zones 

Notes

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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Copyright information

© The Chinese Society for Metals and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Shenyang National Laboratory for Materials Science, Institute of Metal ResearchChinese Academy of SciencesShenyangChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Ministry of EducationGuilin University of TechnologyGuilinChina

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