Journal
ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume 31, Issue 2, Pages 134-142Publisher
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-017-0626-z
Keywords
Metal matrix composites; Carbon nanotubes; Precipitate-free zones
Categories
Funding
- National Key Research & Development Plan [2017YFB0703100]
- Key Research Program of Frontier Sciences, CAS
- National Natural Science Foundation of China [51501189]
- CAS/SAFEA International Partnership Program for Creative Research Teams
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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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