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Gao J.,Key Laboratory of New Processing Technology for Nonferrous Metal & Materials | Gao J.,Guilin University of Technology | Tang X.,Key Laboratory of New Processing Technology for Nonferrous Metal & Materials | Tang X.,Guilin University of Technology | And 3 more authors.
Zhuzao/Foundry | Year: 2015

Cu-coated α-Al2O3 powders were successfully prepared by electroless plating process in this work. The effects of the addition of Cu-coated Al2O3 powders on the microstructure and properties of aluminum matrix composites were studied. The Cu-coated Al2O3 powders were added into the aluminum molten Al-7Si-0.3Mg with the ultrasonic vibration assisted. The analysis of the microstructure and properties showed that the sizes of grains in the alloy with Cu/Al2O3-doped were decreased obviously and the dendrite changed to equiaxed grain. Comparing with 1.0wt. % Al2O3-doped, the yield, tensile strength and elongation of Cu/Al2O3-doped alloy improved obviously. The results show that the wettability of Al matrix was improved because of strength particle Cu/Al2O3 adding. This could induce the heterogeneous nucleation, change the growth behavior of the grains and the microstructure of materials. As a result, the combination properties of the composites were improved. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source


Huang S.-Y.,Key Laboratory of New Processing Technology for Nonferrous Metal & Materials | Huang S.-Y.,Guilin University of Technology | Tang X.,Key Laboratory of New Processing Technology for Nonferrous Metal & Materials | Tang X.,Guilin University of Technology | And 2 more authors.
Zhuzao/Foundry | Year: 2015

Silicon dioxide nanoparticles reinforced aluminum matrix nanocomposite was fabricated by ultrasonic processing. The mechanical properties and microstructures of the prepared samples were analyzed. Experimental results show that the mechanical properties of the as-cast Al-7Si-0.3Mg alloy were increased with the addition of 1 wt% SiO2 nanoparticales. The main reason could be attributed to the modification of eutectic Si and grain refinement. The nanocomposites were further enhanced in yield and tensile strength after T6 heat treatment, but ductility did not improved greatly. © 2015, Chinese Mechanical Engineering Society. All right reserved. Source

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