Solid-state interfacial reaction and load transfer efficiency in carbon nanotubes (CNTs)-reinforced aluminum matrix composites

Carbon nanotubes (CNTs)/aluminum (Al) composites with various interfacial reaction degrees were fabricated by powder metallurgy at sintering temperature range of 700–900 K (75–96% melting point of Al). Interfacial reaction product, aluminum carbide (Al4C3), was formed in Al matrix composites (AMCs)...

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Bibliographic Details
Published in:Carbon (New York) 2017-04, Vol.114, p.198-208
Main Authors: Chen, B., Shen, J., Ye, X., Imai, H., Umeda, J., Takahashi, M., Kondoh, K.
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Aluminum base alloys
Aluminum carbide
Aluminum matrix composites
Carbon nanotubes
Efficiency
Interfacial strength
Load transfer
Melting
Metal matrix composites
Nanorods
Nanotubes
Particulate composites
Powder metallurgy
Sintering
Tensile tests
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Summary:Carbon nanotubes (CNTs)/aluminum (Al) composites with various interfacial reaction degrees were fabricated by powder metallurgy at sintering temperature range of 700–900 K (75–96% melting point of Al). Interfacial reaction product, aluminum carbide (Al4C3), was formed in Al matrix composites (AMCs) reinforced by homogeneously-dispersed CNTs. Microscopy observations revealed three types of temperature-dependent interfaces, i) clean CNT-Al interfaces without interfacial carbide, ii) CNT-Al4C3-Al interfaces for partially reacted CNTs with Al4C3 nanoparticles, and iii) Al4C3-Al interface for in-situ Al4C3 nanorods evolved from completely reacted CNTs. Interfacial Al4C3 on partially reacted CNTs led to significant improvement of interfacial strength and consequent enhancement of load transfer efficiency in AMCs, compared to those composites without carbide. The load transfer mechanism of CNTs in composites was confirmed by the pull-out phenomena during in-situ tensile tests. The role of interfacial carbide played in determining the load transfer efficiency of CNTs was discussed. This study may provide new insights into the interfacial phenomena and load transfer mechanism in CNT-reinforced metal matrix composites. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2016.12.013