期刊
MATERIALS CHARACTERIZATION
卷 133, 期 -, 页码 122-132出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2017.09.036
关键词
Carbon nanotubes; Al matrix composites; Microstructure evolution; Transmission electron microscopy; Al4C3
类别
资金
- Science Foundation of the Yunnan Provincial Science and Technology Department [2014FC001, 2017HC033]
- National Natural Science Foundation of China [51361017, 51401098, 51301079]
- Natural Science Foundation of Kunming University of Science and Technology [KKSY201551036]
- Science Foundation of Rare and Precious Metals Advanced Materials Collaborative Innovation Center of Yunnan Province [KKPT201551005]
Carbon nanotubes reinforced pure aluminum (CNT/Al) composites were fabricated by combined ball milling and powder metallurgy (PM) techniques. The distribution of CNTs, the evolution of the average Al grain size of the powder mixtures and as-prepared composite bulks were investigated, and the mechanical properties of the composites were also tested. With increasing ball milling time, the entangled CNTs were broken, gradually achieving a uniform dispersion within the Al matrix. The microstructure became denser and the Al grains in the powder mixture and extruded composites got significantly refined. Some small-sized Al4C3 needles along the Al grain boundaries were observed using transmission electron microscopy (TEM). The in-situ formed Al4C3 rods have an orientation relation with the Al matrix as Al4C3 [110]//Al [(1) over bar 12], which strongly improved the Al-CNT interface bonding. The yield and the ultimate tensile strength of the composites significantly increased, when the ball milling time increased from 2 to 12 h, finally reaching about 210 +/- 4.2 MPa and 253 +/- 3.7 MPa, respectively, for the composite milled for 12 h. The enhancement of mechanical properties mainly stems from the uniform distribution of CNTs, the grain refinement of the Al matrix and the in-situ formed Al4C3.
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