Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 823, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.153824
Keywords
Carbon nanotubes; Aluminum matrix composites; Titanium; Microstructure; Mechanical properties
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Funding
- Science Foundation of the Yunnan Provincial Science and Technology Department [2018FB085, 2017HC033, 2016CYH08]
- Rare and Precious Metal Materials Genome Engineering Project of Yunnan Province [2018ZE007]
- Foundation of Zhongshan Municipal Science and Technology Program (Platform Construction and innovation Team) [2015F1FC00036, 2016F2FC0005, 2017G1FC0003]
- Zhongshan Collaborative Innovation Fund [2018C1001]
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Carbon nanotube reinforced aluminum matrix (CNT/Al) composites with various microstructures were fabricated by powder metallurgy via introducing nano-sized and micron-sized Ti powders into the CN-TAl system. The size-dependent effects of Ti powders on the microstructure evolution and mechanical properties were further investigated. The results reveal that the best enhancement (similar to 51% of UTS) was obtained by adding 80 nm sized Ti powders into the CNT/Al composite compared with the composite without Ti addition, which mainly derives from the synergistic strengthening of the homogenously dispersed CNTs, a large quantity of in-situ formed nano-sized TiAl3 particles and fine grains. Meanwhile, it is also noted that the addition of micron-sized Ti powders can help the CNT dispersion in powder fabrication stage, and subsequently in-situ formed core-shell structured particles with different interface reaction degree in the Al matrix. Among them, 1 mu m was determined to be the optimal size of Ti for the maximum formation of core-shell structured particles, which best exploits the load transfer ability of TiAl3 shell layers at their interfaces, and finally attributes to significant strength enhancement (similar to 35% of UTS). This research provides a valuable reference concerning the size effects of addition metal in future fabrication of CNTs reinforced metal matrix composites with alternative microstructure. (C) 2020 Elsevier B.V. All rights reserved.
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