Journal
COMPOSITES PART B-ENGINEERING
Volume 212, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.108700
Keywords
Metal matrix composites; Mechanical; properties; Graphene Powder metallurgy
Funding
- Chinese National Science Fund for Distinguished Young Scholars [52025015]
- Chinese National Natural Science Foundation [51771130, 52071230]
- Tianjin youth talent support program
- Tianjin Natural Science Funds for Distinguished Young Scholars [17JCJQJC44300]
- Tianjin Science and Technology Support Project [17ZXCLGX00060]
- Equipment Advance Research Fund [61409220102]
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This study successfully dispersed nano-sized graphene nanoplates with high-content in the matrix uniformly by a modified ball milling strategy, which led to the simultaneous enhancement of strength and uniform elongation of the composites.
Simultaneously achieving high strength and ductility is a critical issue for graphene reinforced aluminum matrix composites, which couldn't be resolved by the conventional mechanical milling-powder metallurgy technology due to the following reasons. On one hand, the low addition of graphene in the matrix traceable to its poor dispersibility limits the further strength improvement. On the other hand, the introduced graphene tends to distribute into grain boundaries rather than inside grains, which would result in stress concentrations at grain boundaries and localized strains, leading to the poor ductility of graphene/Al composites. In this work, intragranular nano-sized graphene nanoplates with high-content were dispersed in the matrix uniformly by a modified ball milling strategy, which induces that the strength and uniform elongation of the composites were simultaneously enhanced due to the improved work hardenability. Furthermore, the strengthening and toughening mechanisms were also discussed. This work offers a new insight into the fabrication and design of graphene/Al composites with both high strength and ductility.
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