期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.08.032
关键词
Nanocomposite; Workability; Nanoindentation hardness; Dislocation; Transmission electron microscopy (TEM)
Workability and mechanical properties of the ultrasonically cast Al-X wt% Al2O3 (X=2, 3.57 and 4.69) metal matrix nanocomposites were reported in the present investigation. The Al-Al2O3 (average size similar to 10 nm) composites showed maximum reduction ratios of 2, 1.75 and 1.41 at room temperature, and 8, 7 and 6 at 300 degrees C. The elastic modulus, nanoindentation hardness, microhardness and Vickers hardness were measured on the as-cast, cold and hot rolled specimens. The tensile properties were also evaluated for the as-cast composites for different wt% of reinforcement. The microstructural examination was done by optical, scanning and transmission electron microscopy. The strength and workability of the nanocomposites were discussed in the light of dislocation/particle interaction, particle size and its concentration, inter-particle spacing and working temperature. 2 wt% of Al2O3 reinforcement showed better combination of workability and mechanical properties possibly due to better distribution of particulates in the matrix. (C) 2012 Elsevier B.V. All rights reserved.
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